[v5.15] INFO: task hung in vfs_unlink
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syzbot
Mar 26, 2023, 12:46:44 PM3/26/23
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 115472395b0a Linux 5.15.104
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=160586d5c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=f5592cc4916e1c2f
dashboard link: https://syzkaller.appspot.com/bug?extid=d738302f9ce196366f74
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f3ae8bcacf2c/disk-11547239.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/19fe19f59498/vmlinux-11547239.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a9b2a883d0a1/bzImage-11547239.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d73830...@syzkaller.appspotmail.com
INFO: task syz-executor.0:23116 blocked for more than 143 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:21016 pid:23116 ppid: 1 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
__down_write_common kernel/locking/rwsem.c:1284 [inline]
__down_write kernel/locking/rwsem.c:1293 [inline]
down_write+0x164/0x170 kernel/locking/rwsem.c:1542
inode_lock include/linux/fs.h:787 [inline]
vfs_unlink+0xe0/0x5f0 fs/namei.c:4198
do_unlinkat+0x49d/0x940 fs/namei.c:4277
__do_sys_unlink fs/namei.c:4325 [inline]
__se_sys_unlink fs/namei.c:4323 [inline]
__x64_sys_unlink+0x45/0x50 fs/namei.c:4323
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f094287ea67
RSP: 002b:00007fff005142c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f094287ea67
RDX: 00007fff00514300 RSI: 00007fff00514300 RDI: 00007fff00514390
RBP: 00007fff00514390 R08: 0000000000000001 R09: 00007fff00514160
R10: 0000555556a808e3 R11: 0000000000000206 R12: 00007f09428d9b74
R13: 00007fff00515450 R14: 0000555556a80810 R15: 00007fff00515490
</TASK>
INFO: task syz-executor.2:25748 blocked for more than 143 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:22464 pid:25748 ppid: 22952 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f8969f37101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f896a056f80 RCX: 00007f8969f370f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f8969f92b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe0524517f R14: 00007f89684a9300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.1:25759 blocked for more than 144 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:22200 pid:25759 ppid: 16340 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f1848a0d101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1848b2cf80 RCX: 00007f1848a0d0f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f1848a68b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffdf2092e8f R14: 00007f1846f7f300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.2:25776 blocked for more than 145 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:22464 pid:25776 ppid: 22952 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f8969f37101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f896a056f80 RCX: 00007f8969f370f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f8969f92b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe0524517f R14: 00007f89684a9300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.0:25789 blocked for more than 146 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:22648 pid:25789 ppid: 23116 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f094287f101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f094299ef80 RCX: 00007f094287f0f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f09428dab39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fff0051516f R14: 00007f0940df1300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.1:25796 blocked for more than 147 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:22648 pid:25796 ppid: 16340 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f1848a0d101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1848b2cf80 RCX: 00007f1848a0d0f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f1848a68b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffdf2092e8f R14: 00007f1846f7f300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.3:25800 blocked for more than 148 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:22840 pid:25800 ppid: 24029 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xaf6a
RSP: 002b:00000000200000a8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fcd8c7a8050 RCX: 00007fcd8c6880f9
RDX: 00000000200000c0 RSI: 00000000200000a0 RDI: 0000000000800000
RBP: 00007fcd8c6e3b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffcc7e4549f R14: 00007fcd8abd9300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.2:25801 blocked for more than 149 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:22840 pid:25801 ppid: 22952 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xaf6a
RSP: 002b:00000000200000a8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f896a057050 RCX: 00007f8969f370f9
RDX: 00000000200000c0 RSI: 00000000200000a0 RDI: 0000000000800000
RBP: 00007f8969f92b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe0524517f R14: 00007f8968488300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.2:25831 blocked for more than 150 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:22264 pid:25831 ppid: 22952 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xaf6a
RSP: 002b:00000000200000a8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f896a057050 RCX: 00007f8969f370f9
RDX: 00000000200000c0 RSI: 00000000200000a0 RDI: 0000000000800000
RBP: 00007f8969f92b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe0524517f R14: 00007f8968488300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.1:25833 blocked for more than 151 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:22680 pid:25833 ppid: 16340 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f1848a0d101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1848b2cf80 RCX: 00007f1848a0d0f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f1848a68b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffdf2092e8f R14: 00007f1846f7f300 R15: 0000000000022000
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c91b920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3267:
#0: ffff8880247ed098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900024bb2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1da0 drivers/tty/n_tty.c:2147
3 locks held by syz-executor.0/23116:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377
#1: ffff8880304483f0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
#1: ffff8880304483f0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: do_unlinkat+0x260/0x940 fs/namei.c:4260
#2: ffff88805b1ee7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#2: ffff88805b1ee7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_unlink+0xe0/0x5f0 fs/namei.c:4198
4 locks held by kworker/u4:4/24956:
#0: ffff888013f96138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2279
#1: ffffc9000b3afd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2281
#2: ffff88802513ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1f6/0x3d10 fs/ext4/inode.c:2687
#3: ffff88814b038990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x12d5/0x1590 fs/jbd2/transaction.c:466
3 locks held by syz-executor.2/25748:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888042b9dda8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888042b9dda8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.1/25759:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888037ea83f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888037ea83f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.2/25776:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888044253fc0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888044253fc0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.0/25789:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff88805b7dd3b0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff88805b7dd3b0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.1/25796:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880607749b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880607749b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.3/25800:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880607721d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880607721d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.2/25801:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880607703f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880607703f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.2/25831:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888026a57198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888026a57198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.1/25833:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880479fc9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880479fc9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
2 locks held by syz-executor.0/25837:
#0: ffff88802513ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1f6/0x3d10 fs/ext4/inode.c:2687
#1: ffff88814b038990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x12d5/0x1590 fs/jbd2/transaction.c:466
3 locks held by syz-executor.2/25862:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff88804bb3c9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff88804bb3c9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.1/25865:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888042c42bd0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888042c42bd0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
1 lock held by syz-executor.0/25870:
3 locks held by syz-executor.3/25885:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888026a15da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888026a15da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
2 locks held by syz-executor.0/25910:
3 locks held by syz-executor.3/25939:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880743b21d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880743b21d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.0/25953:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880502c97e0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880502c97e0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.0/25991:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880740fc9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880740fc9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.0/26025:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff88805b1ee7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff88805b1ee7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.104-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:295
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 21 Comm: kworker/1:0 Not tainted 5.15.104-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: 115472395b0a Linux 5.15.104
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=160586d5c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=f5592cc4916e1c2f
dashboard link: https://syzkaller.appspot.com/bug?extid=d738302f9ce196366f74
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f3ae8bcacf2c/disk-11547239.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/19fe19f59498/vmlinux-11547239.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a9b2a883d0a1/bzImage-11547239.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d73830...@syzkaller.appspotmail.com
INFO: task syz-executor.0:23116 blocked for more than 143 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:21016 pid:23116 ppid: 1 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
__down_write_common kernel/locking/rwsem.c:1284 [inline]
__down_write kernel/locking/rwsem.c:1293 [inline]
down_write+0x164/0x170 kernel/locking/rwsem.c:1542
inode_lock include/linux/fs.h:787 [inline]
vfs_unlink+0xe0/0x5f0 fs/namei.c:4198
do_unlinkat+0x49d/0x940 fs/namei.c:4277
__do_sys_unlink fs/namei.c:4325 [inline]
__se_sys_unlink fs/namei.c:4323 [inline]
__x64_sys_unlink+0x45/0x50 fs/namei.c:4323
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f094287ea67
RSP: 002b:00007fff005142c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f094287ea67
RDX: 00007fff00514300 RSI: 00007fff00514300 RDI: 00007fff00514390
RBP: 00007fff00514390 R08: 0000000000000001 R09: 00007fff00514160
R10: 0000555556a808e3 R11: 0000000000000206 R12: 00007f09428d9b74
R13: 00007fff00515450 R14: 0000555556a80810 R15: 00007fff00515490
</TASK>
INFO: task syz-executor.2:25748 blocked for more than 143 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:22464 pid:25748 ppid: 22952 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f8969f37101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f896a056f80 RCX: 00007f8969f370f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f8969f92b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe0524517f R14: 00007f89684a9300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.1:25759 blocked for more than 144 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:22200 pid:25759 ppid: 16340 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f1848a0d101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1848b2cf80 RCX: 00007f1848a0d0f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f1848a68b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffdf2092e8f R14: 00007f1846f7f300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.2:25776 blocked for more than 145 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:22464 pid:25776 ppid: 22952 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f8969f37101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f896a056f80 RCX: 00007f8969f370f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f8969f92b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe0524517f R14: 00007f89684a9300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.0:25789 blocked for more than 146 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:22648 pid:25789 ppid: 23116 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f094287f101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f094299ef80 RCX: 00007f094287f0f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f09428dab39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fff0051516f R14: 00007f0940df1300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.1:25796 blocked for more than 147 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:22648 pid:25796 ppid: 16340 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f1848a0d101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1848b2cf80 RCX: 00007f1848a0d0f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f1848a68b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffdf2092e8f R14: 00007f1846f7f300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.3:25800 blocked for more than 148 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:22840 pid:25800 ppid: 24029 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xaf6a
RSP: 002b:00000000200000a8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fcd8c7a8050 RCX: 00007fcd8c6880f9
RDX: 00000000200000c0 RSI: 00000000200000a0 RDI: 0000000000800000
RBP: 00007fcd8c6e3b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffcc7e4549f R14: 00007fcd8abd9300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.2:25801 blocked for more than 149 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:22840 pid:25801 ppid: 22952 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xaf6a
RSP: 002b:00000000200000a8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f896a057050 RCX: 00007f8969f370f9
RDX: 00000000200000c0 RSI: 00000000200000a0 RDI: 0000000000800000
RBP: 00007f8969f92b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe0524517f R14: 00007f8968488300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.2:25831 blocked for more than 150 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:22264 pid:25831 ppid: 22952 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0xaf6a
RSP: 002b:00000000200000a8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f896a057050 RCX: 00007f8969f370f9
RDX: 00000000200000c0 RSI: 00000000200000a0 RDI: 0000000000800000
RBP: 00007f8969f92b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe0524517f R14: 00007f8968488300 R15: 0000000000022000
</TASK>
INFO: task syz-executor.1:25833 blocked for more than 151 seconds.
Not tainted 5.15.104-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:22680 pid:25833 ppid: 16340 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5023 [inline]
__schedule+0x12c4/0x4590 kernel/sched/core.c:6369
schedule+0x11b/0x1f0 kernel/sched/core.c:6452
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
__writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2659
try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2707
ext4_nonda_switch fs/ext4/inode.c:2943 [inline]
ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2970
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f1848a0d101
RSP: 002b:00000000200000c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1848b2cf80 RCX: 00007f1848a0d0f9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 000000002e884400
RBP: 00007f1848a68b39 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffdf2092e8f R14: 00007f1846f7f300 R15: 0000000000022000
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c91b920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3267:
#0: ffff8880247ed098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900024bb2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1da0 drivers/tty/n_tty.c:2147
3 locks held by syz-executor.0/23116:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377
#1: ffff8880304483f0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
#1: ffff8880304483f0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: do_unlinkat+0x260/0x940 fs/namei.c:4260
#2: ffff88805b1ee7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#2: ffff88805b1ee7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_unlink+0xe0/0x5f0 fs/namei.c:4198
4 locks held by kworker/u4:4/24956:
#0: ffff888013f96138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2279
#1: ffffc9000b3afd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2281
#2: ffff88802513ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1f6/0x3d10 fs/ext4/inode.c:2687
#3: ffff88814b038990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x12d5/0x1590 fs/jbd2/transaction.c:466
3 locks held by syz-executor.2/25748:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888042b9dda8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888042b9dda8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.1/25759:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888037ea83f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888037ea83f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.2/25776:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888044253fc0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888044253fc0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.0/25789:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff88805b7dd3b0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff88805b7dd3b0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.1/25796:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880607749b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880607749b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.3/25800:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880607721d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880607721d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.2/25801:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880607703f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880607703f0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.2/25831:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888026a57198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888026a57198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.1/25833:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880479fc9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880479fc9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
2 locks held by syz-executor.0/25837:
#0: ffff88802513ebd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1f6/0x3d10 fs/ext4/inode.c:2687
#1: ffff88814b038990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x12d5/0x1590 fs/jbd2/transaction.c:466
3 locks held by syz-executor.2/25862:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff88804bb3c9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff88804bb3c9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.1/25865:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888042c42bd0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888042c42bd0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
1 lock held by syz-executor.0/25870:
3 locks held by syz-executor.3/25885:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff888026a15da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff888026a15da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
2 locks held by syz-executor.0/25910:
3 locks held by syz-executor.3/25939:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880743b21d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880743b21d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.0/25953:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880502c97e0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880502c97e0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.0/25991:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff8880740fc9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880740fc9b8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
3 locks held by syz-executor.0/26025:
#0: ffff88802513c460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825
#1: ffff88805b1ee7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff88805b1ee7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xb9/0x380 fs/ext4/file.c:263
#2: ffff88802513c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2704
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.104-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:295
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 21 Comm: kworker/1:0 Not tainted 5.15.104-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
---
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