[syzbot] INFO: task jbd2/sda1-NUM:NUM blocked in I/O wait for more than NUM seconds.

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: dd6c438c3e64 Merge tag 'vfs-7.1-rc1.fixes' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=128692d2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf32d14ab63e8442
dashboard link: https://syzkaller.appspot.com/bug?extid=c7604c9fdd7580cca4e0
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e8b40cfa7daf/disk-dd6c438c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/50e3a472008e/vmlinux-dd6c438c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dee724704545/bzImage-dd6c438c.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c7604c...@syzkaller.appspotmail.com

INFO: task jbd2/sda1-8:5176 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:26072 pid:5176 tgid:5176 ppid:2 task_flags:0x240040 flags:0x00080000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
io_schedule+0x8a/0xf0 kernel/sched/core.c:8109
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
__wait_on_buffer+0x64/0x70 fs/buffer.c:123
wait_on_buffer include/linux/buffer_head.h:420 [inline]
jbd2_journal_commit_transaction+0x388a/0x6870 fs/jbd2/commit.c:837
kjournald2+0x200/0x760 fs/jbd2/journal.c:201
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
INFO: task syz-executor:5832 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22688 pid:5832 tgid:5832 ppid:5831 task_flags:0x440100 flags:0x00080000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
io_schedule+0x8a/0xf0 kernel/sched/core.c:8109
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x84f/0x1220 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6375
__ext4_mark_inode_dirty+0x18f/0x890 fs/ext4/inode.c:6550
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6587
__mark_inode_dirty+0x1f3/0x1720 fs/fs-writeback.c:2623
generic_update_time fs/inode.c:2192 [inline]
file_update_time_flags+0x46b/0x500 fs/inode.c:2422
ext4_page_mkwrite+0x324/0x1890 fs/ext4/inode.c:6753
do_page_mkwrite+0x17a/0x440 mm/memory.c:3668
wp_page_shared mm/memory.c:4069 [inline]
do_wp_page+0xa77/0x4350 mm/memory.c:4288
handle_pte_fault mm/memory.c:6427 [inline]
__handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6549
handle_mm_fault+0x36d/0xa20 mm/memory.c:6718
do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fa035d6eec0
RSP: 002b:00007ffc588679c8 EFLAGS: 00010246
RAX: 00007fa02f7e2ffc RBX: 00007ffc58867b70 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: 00007fa02f7e2ffc
RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fa02f40021c R11: 000000000000000e R12: 000000000001cff4
R13: 000000000001cfda R14: 0000000000000010 R15: 00007ffc58867b70
</TASK>
INFO: task syz.0.297:7190 blocked in I/O wait for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.297 state:D stack:27128 pid:7190 tgid:7190 ppid:5849 task_flags:0x440040 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
io_schedule+0x8a/0xf0 kernel/sched/core.c:8109
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x84f/0x1220 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6375
__ext4_mark_inode_dirty+0x18f/0x890 fs/ext4/inode.c:6550
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6587
__mark_inode_dirty+0x1f3/0x1720 fs/fs-writeback.c:2623
generic_update_time fs/inode.c:2192 [inline]
file_update_time_flags+0x46b/0x500 fs/inode.c:2422
ext4_page_mkwrite+0x324/0x1890 fs/ext4/inode.c:6753
do_page_mkwrite+0x17a/0x440 mm/memory.c:3668
do_shared_fault mm/memory.c:5969 [inline]
do_fault+0x3b5/0x1750 mm/memory.c:6031
do_pte_missing mm/memory.c:4550 [inline]
handle_pte_fault mm/memory.c:6411 [inline]
__handle_mm_fault+0x187d/0x2a00 mm/memory.c:6549
handle_mm_fault+0x36d/0xa20 mm/memory.c:6718
do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f4957e70f40
RSP: 002b:00007fffdf4618d0 EFLAGS: 00010202
RAX: 0000001b31ef5000 RBX: ffffffff82568f11 RCX: 0000001b31ef4ff8
RDX: 0000001b31b24220 RSI: 0000000000000008 RDI: 00007f4958d45720
RBP: 00000000000001a6 R08: 00007f4958200000 R09: 00007f4958202000
R10: 0000000082568f15 R11: 0000000000000010 R12: 00007f4958216038
R13: 00000000000002e8 R14: ffffffff825688e4 R15: 00007f4958d45720
</TASK>
INFO: task syz.1.299:7195 blocked in I/O wait for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.299 state:D stack:27384 pid:7195 tgid:7195 ppid:5843 task_flags:0x440040 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
io_schedule+0x8a/0xf0 kernel/sched/core.c:8109
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x84f/0x1220 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6375
__ext4_mark_inode_dirty+0x18f/0x890 fs/ext4/inode.c:6550
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6587
__mark_inode_dirty+0x1f3/0x1720 fs/fs-writeback.c:2623
generic_update_time fs/inode.c:2192 [inline]
touch_atime+0x642/0x7a0 fs/inode.c:2267
file_accessed include/linux/fs.h:2264 [inline]
ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:840
vfs_mmap_prepare include/linux/fs.h:2076 [inline]
call_mmap_prepare mm/vma.c:2672 [inline]
__mmap_region+0xe98/0x2da0 mm/vma.c:2755
mmap_region+0x527/0x620 mm/vma.c:2856
do_mmap+0xc63/0x12f0 mm/mmap.c:560
vm_mmap_pgoff+0x29e/0x470 mm/util.c:581
ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:606
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e3d39c582
RSP: 002b:00007fffab0ea828 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b31c64000 RCX: 00007f8e3d39c582
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b31c64000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 0000000000000047
R13: 00000000000927c0 R14: 000000000002f9d5 R15: 00007fffab0eab00
</TASK>
INFO: task syz.2.298:7196 blocked in I/O wait for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.298 state:D stack:27384 pid:7196 tgid:7196 ppid:5853 task_flags:0x440040 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
io_schedule+0x8a/0xf0 kernel/sched/core.c:8109
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x84f/0x1220 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6375
__ext4_mark_inode_dirty+0x18f/0x890 fs/ext4/inode.c:6550
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6587
__mark_inode_dirty+0x1f3/0x1720 fs/fs-writeback.c:2623
generic_update_time fs/inode.c:2192 [inline]
touch_atime+0x642/0x7a0 fs/inode.c:2267
file_accessed include/linux/fs.h:2264 [inline]
ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:840
vfs_mmap_prepare include/linux/fs.h:2076 [inline]
call_mmap_prepare mm/vma.c:2672 [inline]
__mmap_region+0xe98/0x2da0 mm/vma.c:2755
mmap_region+0x527/0x620 mm/vma.c:2856
do_mmap+0xc63/0x12f0 mm/mmap.c:560
vm_mmap_pgoff+0x29e/0x470 mm/util.c:581
ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:606
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6eda39c582
RSP: 002b:00007ffc7d052448 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b31d64000 RCX: 00007f6eda39c582
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b31d64000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 0000000000000048
R13: 00000000000927c0 R14: 000000000002fd0a R15: 00007ffc7d052720
</TASK>

Showing all locks held in the system:
6 locks held by kworker/u8:1/13:
#0: ffff888020e8a940 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12d6/0x1980 kernel/workqueue.c:3277
#1: ffffc90000127d08 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x973/0x1980 kernel/workqueue.c:3278
#2: ffff88803313a0d8 (&type->s_umount_key#33){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:565
#3: ffff888033138c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2575
#4: ffff8880330b6938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
#5: ffff88807a935fd0 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x45a/0xd30 fs/ext4/inode.c:823
1 lock held by khungtaskd/31:
#0: ffffffff8e7e5260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e7e5260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e7e5260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
2 locks held by getty/5602:
#0: ffff888038d560a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14f0 drivers/tty/n_tty.c:2211
3 locks held by syz-executor/5832:
#0: ffff888037e99448 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310
#1: ffff88803313a508 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x440 mm/memory.c:3668
#2: ffff8880330b6938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
3 locks held by syz.0.297/7190:
#0: ffff8880565b7948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310
#1: ffff88803313a508 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x440 mm/memory.c:3668
#2: ffff8880330b6938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
3 locks held by syz.1.299/7195:
#0: ffff888028438f78 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
#0: ffff888028438f78 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
#1: ffff88803313a410 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2264 [inline]
#1: ffff88803313a410 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:840
#2: ffff8880330b6938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
3 locks held by syz.2.298/7196:
#0: ffff888028438338 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
#0: ffff888028438338 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
#1: ffff88803313a410 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2264 [inline]
#1: ffff88803313a410 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:840
#2: ffff8880330b6938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>


---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 26fd6bff2c05 Merge tag 'mtd/fixes-for-7.1-rc2' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1229bece580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d0f0911eedbc130a

dashboard link: https://syzkaller.appspot.com/bug?extid=c7604c9fdd7580cca4e0
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17f37506580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=171441ce580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7d72741f9879/disk-26fd6bff.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b02c6a1eba87/vmlinux-26fd6bff.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4f218b09b68f/bzImage-26fd6bff.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c7604c...@syzkaller.appspotmail.com

INFO: task jbd2/sda1-8:4955 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:jbd2/sda1-8 state:D stack:26088 pid:4955 tgid:4955 ppid:2 task_flags:0x240040 flags:0x00080000

Call Trace:
<TASK>
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
io_schedule+0x8a/0xf0 kernel/sched/core.c:8109
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
__wait_on_buffer+0x64/0x70 fs/buffer.c:123
wait_on_buffer include/linux/buffer_head.h:420 [inline]
jbd2_journal_commit_transaction+0x388a/0x6870 fs/jbd2/commit.c:837
kjournald2+0x200/0x760 fs/jbd2/journal.c:201
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>

INFO: task syz.0.189:6070 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:syz.0.189 state:D stack:28240 pid:6070 tgid:6070 ppid:5783 task_flags:0x440040 flags:0x00080002

RIP: 0033:0x7f97a466a883
RSP: 002b:00007ffc3f813c60 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2e124000 RSI: 0000000000040000 RDI: 00007f97a49db710
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc3f813ef0

</TASK>

Showing all locks held in the system:

1 lock held by ksoftirqd/1/23:
#0: ffff8880b853b3e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x140 kernel/sched/core.c:652
1 lock held by khungtaskd/30:
#0: ffffffff8e7e52e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e7e52e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e7e52e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
6 locks held by kworker/u8:3/47:
#0: ffff88801c6ca140 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12d6/0x1980 kernel/workqueue.c:3277
#1: ffffc90000b77d08 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x973/0x1980 kernel/workqueue.c:3278
#2: ffff8880389060d8 (&type->s_umount_key#33){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:565
#3: ffff888038904c18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2575
#4: ffff888038902938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
#5: ffff88807928f290 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x45a/0xd30 fs/ext4/inode.c:823
2 locks held by getty/5383:
#0: ffff88802dace0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243

#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14f0 drivers/tty/n_tty.c:2211

3 locks held by syz.0.189/6070:
#0: ffff88807e006bc8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310
#1: ffff888038906508 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x440 mm/memory.c:3668
#2: ffff888038902938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444
3 locks held by syz-executor/6077:
#0: ffff888038906410 (sb_writers#4){.+.+}-{0:0}, at: filename_create+0x10d/0x400 fs/namei.c:4943
#1: ffff8880792b1f98 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1074 [inline]
#1: ffff8880792b1f98 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2914 [inline]
#1: ffff8880792b1f98 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2938 [inline]
#1: ffff8880792b1f98 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1c0/0x400 fs/namei.c:4950
#2: ffff888038902938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfaa/0x13a0 fs/jbd2/transaction.c:444

=============================================

NMI backtrace for cpu 0

CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>

Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1057 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026

Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:smp_call_function_many_cond+0xdd4/0x1700 kernel/smp.c:871
Code: 00 00 0f 84 1e 05 00 00 e8 c9 6a 0c 00 83 c5 01 bf 07 00 00 00 48 63 dd 48 89 de e8 96 65 0c 00 48 83 fb 07 0f 86 22 fb ff ff <44> 8b 64 24 58 44 8b 7c 24 5c e8 9d 6a 0c 00 8b 5c 24 4c bf 01 00
RSP: 0018:ffffc90003d37870 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81fb686f
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888029b83d80
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90003d37958
R13: ffff8880b843c6c0 R14: ffff8880b843c601 R15: ffff8880b853c710
FS: 0000000000000000(0000) GS:ffff88812447d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a400fed660 CR3: 000000000e596000 CR4: 00000000003526f0
Call Trace:
<TASK>
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057
on_each_cpu include/linux/smp.h:72 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2773 [inline]
smp_text_poke_batch_finish+0x976/0xc60 arch/x86/kernel/alternative.c:3045
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
jump_label_update+0x37a/0x550 kernel/jump_label.c:910
static_key_enable_cpuslocked+0x1bc/0x270 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate mm/kfence/core.c:906 [inline]
toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:898
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
process_scheduled_works kernel/workqueue.c:3385 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466

kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>

----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 0f 84 1e 05 00 00 je 0x526
8: e8 c9 6a 0c 00 call 0xc6ad6
d: 83 c5 01 add $0x1,%ebp
10: bf 07 00 00 00 mov $0x7,%edi
15: 48 63 dd movslq %ebp,%rbx
18: 48 89 de mov %rbx,%rsi
1b: e8 96 65 0c 00 call 0xc65b6
20: 48 83 fb 07 cmp $0x7,%rbx
24: 0f 86 22 fb ff ff jbe 0xfffffb4c
* 2a: 44 8b 64 24 58 mov 0x58(%rsp),%r12d <-- trapping instruction
2f: 44 8b 7c 24 5c mov 0x5c(%rsp),%r15d
34: e8 9d 6a 0c 00 call 0xc6ad6
39: 8b 5c 24 4c mov 0x4c(%rsp),%ebx
3d: bf .byte 0xbf
3e: 01 00 add %eax,(%rax)


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.

***

Subject: [PATCH] PCI/proc: validate user buffer before touching config space
Author: karti...@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master



proc_bus_pci_write() invokes __get_user() repeatedly without checking
its return value. When the user pointer faults, the extable fixup
leaves the destination indeterminate but the function still hands the
value to pci_user_write_config_*(), writing fixup state to PCI
configuration space.

syzbot triggers this with a writev() whose iov_base is NULL on
/proc/bus/pci/00/03.0 (the virtio-blk controller in the syzkaller VM).
Every __get_user() faults, val ends up as fixup-zero, and zero is
written to config space offsets 0..6 -- including the Command register
at offset 4, clearing Bus Master and Memory Space Enable. The disk
goes silent mid-flight, in-flight journal bios never complete, and
jbd2 hangs in wait_on_buffer() indefinitely:

INFO: task jbd2/sda1-8:4955 blocked in I/O wait for more than 143 seconds.
__wait_on_buffer fs/buffer.c:123
jbd2_journal_commit_transaction+0x388a/0x6870 fs/jbd2/commit.c:837
kjournald2 fs/jbd2/journal.c:201

proc_bus_pci_read() has the symmetric problem: an unchecked __put_user()
into a faulting user pointer silently drops config-space data.

Fix both by staging through a kernel buffer. The write path uses
memdup_user() to copy the user buffer up front; a bad user pointer now
returns -EFAULT before any device state is touched, and the function
no longer races a concurrent userspace mutation of the buffer across
successive __get_user()s. The read path collects config-space data
into a kmalloc'd buffer and copy_to_user()s it once at the end.

Reported-by: syzbot+c7604c...@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=c7604c9fdd7580cca4e0
Signed-off-by: Deepanshu Kartikey <karti...@gmail.com>
---
drivers/pci/proc.c | 78 ++++++++++++++++++++++++----------------------
1 file changed, 41 insertions(+), 37 deletions(-)

diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index ce36e35681e8..aa54c4e1445d 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -31,13 +31,14 @@ static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
struct pci_dev *dev = pde_data(file_inode(file));
unsigned int pos = *ppos;
unsigned int cnt, size;
+ void *kbuf;
+ u8 *kp;

/*
* Normal users can read only the standardized portion of the
* configuration space as several chips lock up when trying to read
* undefined locations (think of Intel PIIX4 as a typical example).
*/
-
if (capable(CAP_SYS_ADMIN))
size = dev->cfg_size;
else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
@@ -53,57 +54,61 @@ static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
nbytes = size - pos;
cnt = nbytes;

- if (!access_ok(buf, cnt))
- return -EINVAL;
+ kbuf = kmalloc(cnt, GFP_KERNEL);
+ if (!kbuf)
+ return -ENOMEM;
+ kp = kbuf;

pci_config_pm_runtime_get(dev);

if ((pos & 1) && cnt) {
- unsigned char val;
- pci_user_read_config_byte(dev, pos, &val);
- __put_user(val, buf);
- buf++;
+ pci_user_read_config_byte(dev, pos, kp);
+ kp++;
pos++;
cnt--;
}

if ((pos & 3) && cnt > 2) {
- unsigned short val;
+ u16 val;
pci_user_read_config_word(dev, pos, &val);
- __put_user(cpu_to_le16(val), (__le16 __user *) buf);
- buf += 2;
+ *(__le16 *)kp = cpu_to_le16(val);
+ kp += 2;
pos += 2;
cnt -= 2;
}

while (cnt >= 4) {
- unsigned int val;
+ u32 val;
pci_user_read_config_dword(dev, pos, &val);
- __put_user(cpu_to_le32(val), (__le32 __user *) buf);
- buf += 4;
+ *(__le32 *)kp = cpu_to_le32(val);
+ kp += 4;
pos += 4;
cnt -= 4;
cond_resched();
}

if (cnt >= 2) {
- unsigned short val;
+ u16 val;
pci_user_read_config_word(dev, pos, &val);
- __put_user(cpu_to_le16(val), (__le16 __user *) buf);
- buf += 2;
+ *(__le16 *)kp = cpu_to_le16(val);
+ kp += 2;
pos += 2;
cnt -= 2;
}

if (cnt) {
- unsigned char val;
- pci_user_read_config_byte(dev, pos, &val);
- __put_user(val, buf);
+ pci_user_read_config_byte(dev, pos, kp);
pos++;
}

pci_config_pm_runtime_put(dev);

+ if (copy_to_user(buf, kbuf, nbytes)) {
+ kfree(kbuf);
+ return -EFAULT;
+ }
+ kfree(kbuf);
+
*ppos = pos;
return nbytes;
}
@@ -116,6 +121,8 @@ static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
int pos = *ppos;
int size = dev->cfg_size;
int cnt, ret;
+ const u8 *kp;
+ u8 *kbuf;

ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
if (ret)
@@ -129,56 +136,53 @@ static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
nbytes = size - pos;
cnt = nbytes;

- if (!access_ok(buf, cnt))
- return -EINVAL;
+ kbuf = memdup_user(buf, cnt);
+ if (IS_ERR(kbuf))
+ return PTR_ERR(kbuf);
+ kp = kbuf;

pci_config_pm_runtime_get(dev);

if ((pos & 1) && cnt) {
- unsigned char val;
- __get_user(val, buf);
- pci_user_write_config_byte(dev, pos, val);
- buf++;
+ pci_user_write_config_byte(dev, pos, *kp);
+ kp++;
pos++;
cnt--;
}

if ((pos & 3) && cnt > 2) {
- __le16 val;
- __get_user(val, (__le16 __user *) buf);
+ __le16 val = *(const __le16 *)kp;
pci_user_write_config_word(dev, pos, le16_to_cpu(val));
- buf += 2;
+ kp += 2;
pos += 2;
cnt -= 2;
}

while (cnt >= 4) {
- __le32 val;
- __get_user(val, (__le32 __user *) buf);
+ __le32 val = *(const __le32 *)kp;
pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
- buf += 4;
+ kp += 4;
pos += 4;
cnt -= 4;
}

if (cnt >= 2) {
- __le16 val;
- __get_user(val, (__le16 __user *) buf);
+ __le16 val = *(const __le16 *)kp;
pci_user_write_config_word(dev, pos, le16_to_cpu(val));
- buf += 2;
+ kp += 2;
pos += 2;
cnt -= 2;
}

if (cnt) {
- unsigned char val;
- __get_user(val, buf);
- pci_user_write_config_byte(dev, pos, val);
+ pci_user_write_config_byte(dev, pos, *kp);
pos++;
}

pci_config_pm_runtime_put(dev);

+ kfree(kbuf);
+
*ppos = pos;
i_size_write(ino, dev->cfg_size);
return nbytes;
--
2.43.0

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.

***

Subject: [PATCH] PCI/proc: check return value of __get_user() in proc_bus_pci_write()

Author: karti...@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

proc_bus_pci_write() invokes __get_user() in five places without

checking its return value. When the user pointer faults, the extable
fixup leaves the destination indeterminate but the function still hands
the value to pci_user_write_config_*(), writing fixup state to PCI
configuration space.

syzbot triggers this with a writev() whose iov_base is NULL on
/proc/bus/pci/00/03.0 (the virtio-blk controller in the syzkaller VM).
Every __get_user() faults, val ends up as fixup-zero, and zero is
written to config space offsets 0..6 -- including the Command register
at offset 4, clearing Bus Master and Memory Space Enable. The disk
goes silent mid-flight, in-flight journal bios never complete, and
jbd2 hangs in wait_on_buffer() indefinitely:

INFO: task jbd2/sda1-8:4955 blocked in I/O wait for more than 143 seconds.
__wait_on_buffer fs/buffer.c:123
jbd2_journal_commit_transaction+0x388a/0x6870 fs/jbd2/commit.c:837
kjournald2 fs/jbd2/journal.c:201

Check the return value of every __get_user() and bail with -EFAULT on
failure, releasing the runtime-PM reference via a common exit path.

Reported-by: syzbot+c7604c...@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=c7604c9fdd7580cca4e0
Signed-off-by: Deepanshu Kartikey <karti...@gmail.com>
---

drivers/pci/proc.c | 33 +++++++++++++++++++++++++--------
1 file changed, 25 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index ce36e35681e8..54052157c276 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -136,7 +136,10 @@ static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,

if ((pos & 1) && cnt) {

unsigned char val;
- __get_user(val, buf);

+ if (__get_user(val, buf)) {
+ ret = -EFAULT;
+ goto out;
+ }
pci_user_write_config_byte(dev, pos, val);
buf++;
pos++;
@@ -145,7 +148,10 @@ static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,

if ((pos & 3) && cnt > 2) {

__le16 val;
- __get_user(val, (__le16 __user *) buf);

+ if (__get_user(val, (__le16 __user *) buf)) {
+ ret = -EFAULT;
+ goto out;
+ }
pci_user_write_config_word(dev, pos, le16_to_cpu(val));
buf += 2;
pos += 2;
@@ -154,7 +160,10 @@ static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,

while (cnt >= 4) {

__le32 val;
- __get_user(val, (__le32 __user *) buf);

+ if (__get_user(val, (__le32 __user *) buf)) {
+ ret = -EFAULT;
+ goto out;
+ }
pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
buf += 4;
pos += 4;
@@ -163,7 +172,10 @@ static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,

if (cnt >= 2) {

__le16 val;
- __get_user(val, (__le16 __user *) buf);

+ if (__get_user(val, (__le16 __user *) buf)) {
+ ret = -EFAULT;
+ goto out;
+ }
pci_user_write_config_word(dev, pos, le16_to_cpu(val));
buf += 2;
pos += 2;
@@ -172,16 +184,21 @@ static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,

if (cnt) {

unsigned char val;
- __get_user(val, buf);

+ if (__get_user(val, buf)) {
+ ret = -EFAULT;
+ goto out;
+ }
pci_user_write_config_byte(dev, pos, val);
pos++;
}

+ ret = nbytes;
+out:
pci_config_pm_runtime_put(dev);
-
*ppos = pos;
- i_size_write(ino, dev->cfg_size);
- return nbytes;
+ if (ret > 0)
+ i_size_write(ino, dev->cfg_size);
+ return ret;
}

#ifdef HAVE_PCI_MMAP
--
2.43.0

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c7604c...@syzkaller.appspotmail.com
Tested-by: syzbot+c7604c...@syzkaller.appspotmail.com

Tested on:

commit: cd546f7a Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17880ad2580000

kernel config: https://syzkaller.appspot.com/x/.config?x=d0f0911eedbc130a
dashboard link: https://syzkaller.appspot.com/bug?extid=c7604c9fdd7580cca4e0
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

patch: https://syzkaller.appspot.com/x/patch.diff?x=1668f506580000

Note: testing is done by a robot and is best-effort only.

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c7604c...@syzkaller.appspotmail.com
Tested-by: syzbot+c7604c...@syzkaller.appspotmail.com

Tested on:

commit: cd546f7a Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree: upstream

console output: https://syzkaller.appspot.com/x/log.txt?x=143a2ece580000

kernel config: https://syzkaller.appspot.com/x/.config?x=d0f0911eedbc130a
dashboard link: https://syzkaller.appspot.com/bug?extid=c7604c9fdd7580cca4e0
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

patch: https://syzkaller.appspot.com/x/patch.diff?x=11c50a36580000