[syzbot] [serial?] possible deadlock in task_call_func
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syzbot
Aug 8, 2026, 8:09:36 PM (6 hours ago) Aug 8
to gre...@linuxfoundation.org, jiri...@kernel.org, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 848acc8ffe1b Merge tag 'fsverity-for-linus' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11f57649580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b7079b368dcec295
dashboard link: https://syzkaller.appspot.com/bug?extid=7345f1f964659d825165
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/25bde0bfecb5/disk-848acc8f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8a5ebf809884/vmlinux-848acc8f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1d1810845ac3/bzImage-848acc8f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7345f1...@syzkaller.appspotmail.com
Freezing user space processes
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.7.70/6790 is trying to acquire lock:
ffffffff8eaf4160 (console_owner){-.-.}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:2026 [inline]
ffffffff8eaf4160 (console_owner){-.-.}-{0:0}, at: vprintk_emit+0x4c0/0x6b0 kernel/printk/printk.c:2478
but task is already holding lock:
ffff88802b8c6790 (&p->pi_lock){-.-.}-{2:2}, at: task_call_func+0x8b/0x380 kernel/sched/core.c:4476
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&p->pi_lock){-.-.}-{2:2}:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:571 [inline]
try_to_wake_up+0xbd/0x1c90 kernel/sched/core.c:4292
__wake_up_common+0x135/0x1f0 kernel/sched/wait.c:108
__wake_up_common_lock kernel/sched/wait.c:125 [inline]
__wake_up+0x31/0x60 kernel/sched/wait.c:146
tty_port_default_wakeup+0x47/0x60 drivers/tty/tty_port.c:67
serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1723
serial8250_handle_irq_locked+0x770/0x9a0 drivers/tty/serial/8250/8250_port.c:1837
serial8250_handle_irq.part.0+0xb4/0x530 drivers/tty/serial/8250/8250_port.c:1853
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1849 [inline]
serial8250_default_handle_irq+0xc2/0x280 drivers/tty/serial/8250/8250_port.c:1867
serial8250_interrupt+0xf8/0x1b0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x232/0x880 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
handle_edge_irq+0x34c/0x950 kernel/irq/chip.c:859
generic_handle_irq_desc include/linux/irqdesc.h:188 [inline]
handle_irq arch/x86/kernel/irq.c:209 [inline]
call_irq_handler arch/x86/kernel/irq.c:265 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:280
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:273
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
rcu_read_lock include/linux/rcupdate.h:841 [inline]
page_table_check_clear+0x646/0x8f0 mm/page_table_check.c:77
__page_table_check_pte_clear+0xf1/0x100 mm/page_table_check.c:155
page_table_check_pte_clear include/linux/page_table_check.h:55 [inline]
ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1263 [inline]
get_and_clear_full_ptes include/linux/pgtable.h:879 [inline]
zap_present_folio_ptes mm/memory.c:1648 [inline]
zap_present_ptes mm/memory.c:1730 [inline]
do_zap_pte_range mm/memory.c:1832 [inline]
zap_pte_range mm/memory.c:1934 [inline]
zap_pmd_range mm/memory.c:2020 [inline]
zap_pud_range mm/memory.c:2048 [inline]
zap_p4d_range mm/memory.c:2069 [inline]
__zap_vma_range+0x2ccc/0x4a30 mm/memory.c:2109
unmap_vmas+0x299/0x5f0 mm/memory.c:2178
exit_mmap+0x1ef/0xa00 mm/mmap.c:1300
__mmput+0x12a/0x410 kernel/fork.c:1187
mmput+0x67/0x80 kernel/fork.c:1210
setup_new_exec+0x1d9/0x2a0 fs/exec.c:1353
load_elf_binary+0xa8f/0x51c0 fs/binfmt_elf.c:1024
search_binary_handler fs/exec.c:1694 [inline]
exec_binprm fs/exec.c:1726 [inline]
bprm_execve fs/exec.c:1778 [inline]
bprm_execve+0x8fb/0x1730 fs/exec.c:1754
do_execveat_common.isra.0+0x4a5/0x580 fs/exec.c:1876
__do_sys_execve fs/exec.c:1949 [inline]
__se_sys_execve fs/exec.c:1943 [inline]
__x64_sys_execve+0x93/0xd0 fs/exec.c:1943
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&tty->write_wait){-.-.}-{3:3}:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
__wake_up_common_lock kernel/sched/wait.c:124 [inline]
__wake_up+0x1c/0x60 kernel/sched/wait.c:146
tty_port_default_wakeup+0x47/0x60 drivers/tty/tty_port.c:67
serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1723
serial8250_handle_irq_locked+0x770/0x9a0 drivers/tty/serial/8250/8250_port.c:1837
serial8250_handle_irq.part.0+0xb4/0x530 drivers/tty/serial/8250/8250_port.c:1853
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1849 [inline]
serial8250_default_handle_irq+0xc2/0x280 drivers/tty/serial/8250/8250_port.c:1867
serial8250_interrupt+0xf8/0x1b0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x232/0x880 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
handle_edge_irq+0x34c/0x950 kernel/irq/chip.c:859
generic_handle_irq_desc include/linux/irqdesc.h:188 [inline]
handle_irq arch/x86/kernel/irq.c:209 [inline]
call_irq_handler arch/x86/kernel/irq.c:265 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:280
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:273
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:790 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline]
uart_write+0x29d/0xb20 drivers/tty/serial/serial_core.c:630
process_output_block drivers/tty/n_tty.c:557 [inline]
n_tty_write+0x431/0x1160 drivers/tty/n_tty.c:2366
iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
file_tty_write.isra.0+0x4d2/0x890 drivers/tty/tty_io.c:1081
tty_write drivers/tty/tty_io.c:1102 [inline]
redirected_tty_write drivers/tty/tty_io.c:1125 [inline]
redirected_tty_write+0xd4/0x120 drivers/tty/tty_io.c:1105
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&port_lock_key){-.-.}-{3:3}:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
uart_port_lock_irqsave include/linux/serial_core.h:719 [inline]
serial8250_console_write+0x177/0x1a50 drivers/tty/serial/8250/8250_port.c:3344
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
register_console.cold+0xc0/0x248 kernel/printk/printk.c:4208
univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515
console_init+0x3d5/0x5b0 kernel/printk/printk.c:4407
start_kernel+0x314/0x490 init/main.c:1112
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x158
-> #0 (console_owner){-.-.}-{0:0}:
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
console_trylock_spinning kernel/printk/printk.c:2026 [inline]
vprintk_emit+0x4d1/0x6b0 kernel/printk/printk.c:2478
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__report_bug.cold+0x34/0x141 lib/bug.c:248
report_bug+0xb2/0x220 lib/bug.c:286
handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436
exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:593
__set_task_frozen+0x211/0x2e0 kernel/freezer.c:139
task_call_func+0x169/0x380 kernel/sched/core.c:4495
__freeze_task kernel/freezer.c:150 [inline]
freeze_task+0x151/0x270 kernel/freezer.c:169
try_to_freeze_tasks+0x243/0x680 kernel/power/process.c:54
freeze_processes+0xf2/0x1f0 kernel/power/process.c:137
hibernate.cold+0xf0/0x6a2 kernel/power/hibernate.c:801
state_store+0x1ff/0x240 kernel/power/main.c:821
kobj_attr_store+0x58/0x80 lib/kobject.c:840
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
console_owner --> &tty->write_wait --> &p->pi_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&p->pi_lock);
lock(&tty->write_wait);
lock(&p->pi_lock);
lock(console_owner);
*** DEADLOCK ***
8 locks held by syz.7.70/6790:
#0: ffff88807f88eb70 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2aa/0x380 fs/file.c:1259
#1: ffff8880758ea450 (sb_writers#7){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
#2: ffff88802cf98880 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x2c2/0x5f0 fs/kernfs/file.c:336
#3: ffff8880202a1968 (kn->active#62){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline]
#3: ffff8880202a1968 (kn->active#62){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x332/0x5f0 fs/kernfs/file.c:337
#4: ffffffff8ea9fc80 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x56/0x70 kernel/power/main.c:71
#5: ffffffff8e80a098 (tasklist_lock){.+.+}-{3:3}, at: try_to_freeze_tasks+0x148/0x680 kernel/power/process.c:52
#6: ffffffff8ec181f8 (freezer_lock){....}-{3:3}, at: freeze_task+0x71/0x270 kernel/freezer.c:168
#7: ffff88802b8c6790 (&p->pi_lock){-.-.}-{2:2}, at: task_call_func+0x8b/0x380 kernel/sched/core.c:4476
stack backtrace:
CPU: 0 UID: 0 PID: 6790 Comm: syz.7.70 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
console_trylock_spinning kernel/printk/printk.c:2026 [inline]
vprintk_emit+0x4d1/0x6b0 kernel/printk/printk.c:2478
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__report_bug.cold+0x34/0x141 lib/bug.c:248
report_bug+0xb2/0x220 lib/bug.c:286
handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436
exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:593
RIP: 0010:__set_task_frozen+0x211/0x2e0 kernel/freezer.c:139
Code: 0f b6 04 02 84 c0 74 09 3c 03 7f 05 e8 18 9a 85 00 8b ab 98 0b 00 00 31 ff 89 ee e8 29 02 16 00 85 ed 74 09 e8 b0 07 16 00 90 <0f> 0b 90 e8 a7 07 16 00 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc90003d2f990 EFLAGS: 00010046
RAX: 0000000000080000 RBX: ffff88802b8c5d00 RCX: ffffc900200ea000
RDX: 0000000000080000 RSI: ffffffff81f44c10 RDI: ffff88807aa5be00
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88802b8c5d18
R13: 0000000000000002 R14: dffffc0000000000 R15: ffff88802b8c6778
task_call_func+0x169/0x380 kernel/sched/core.c:4495
__freeze_task kernel/freezer.c:150 [inline]
freeze_task+0x151/0x270 kernel/freezer.c:169
try_to_freeze_tasks+0x243/0x680 kernel/power/process.c:54
freeze_processes+0xf2/0x1f0 kernel/power/process.c:137
hibernate.cold+0xf0/0x6a2 kernel/power/hibernate.c:801
state_store+0x1ff/0x240 kernel/power/main.c:821
kobj_attr_store+0x58/0x80 lib/kobject.c:840
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f63e7f9e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f63e8e70028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f63e8225fa0 RCX: 00007f63e7f9e019
RDX: 0000000000000005 RSI: 0000200000000140 RDI: 0000000000000003
RBP: 00007f63e803500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f63e8226038 R14: 00007f63e8225fa0 R15: 00007fffbeef79e8
</TASK>
debug_locks && p->lockdep_depth
WARNING: kernel/freezer.c:139 at __set_task_frozen+0x211/0x2e0 kernel/freezer.c:139, CPU#0: syz.7.70/6790
Modules linked in:
CPU: 0 UID: 0 PID: 6790 Comm: syz.7.70 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__set_task_frozen+0x211/0x2e0 kernel/freezer.c:139
Code: 0f b6 04 02 84 c0 74 09 3c 03 7f 05 e8 18 9a 85 00 8b ab 98 0b 00 00 31 ff 89 ee e8 29 02 16 00 85 ed 74 09 e8 b0 07 16 00 90 <0f> 0b 90 e8 a7 07 16 00 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc90003d2f990 EFLAGS: 00010046
RAX: 0000000000080000 RBX: ffff88802b8c5d00 RCX: ffffc900200ea000
RDX: 0000000000080000 RSI: ffffffff81f44c10 RDI: ffff88807aa5be00
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88802b8c5d18
R13: 0000000000000002 R14: dffffc0000000000 R15: ffff88802b8c6778
FS: 00007f63e8e706c0(0000) GS:ffff888123dd9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70009556c8 CR3: 00000000551b8000 CR4: 0000000000350ef0
Call Trace:
<TASK>
task_call_func+0x169/0x380 kernel/sched/core.c:4495
__freeze_task kernel/freezer.c:150 [inline]
freeze_task+0x151/0x270 kernel/freezer.c:169
try_to_freeze_tasks+0x243/0x680 kernel/power/process.c:54
freeze_processes+0xf2/0x1f0 kernel/power/process.c:137
hibernate.cold+0xf0/0x6a2 kernel/power/hibernate.c:801
state_store+0x1ff/0x240 kernel/power/main.c:821
kobj_attr_store+0x58/0x80 lib/kobject.c:840
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f63e7f9e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f63e8e70028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f63e8225fa0 RCX: 00007f63e7f9e019
RDX: 0000000000000005 RSI: 0000200000000140 RDI: 0000000000000003
RBP: 00007f63e803500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f63e8226038 R14: 00007f63e8225fa0 R15: 00007fffbeef79e8
</TASK>
---
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 848acc8ffe1b Merge tag 'fsverity-for-linus' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11f57649580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b7079b368dcec295
dashboard link: https://syzkaller.appspot.com/bug?extid=7345f1f964659d825165
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/25bde0bfecb5/disk-848acc8f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8a5ebf809884/vmlinux-848acc8f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1d1810845ac3/bzImage-848acc8f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7345f1...@syzkaller.appspotmail.com
Freezing user space processes
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.7.70/6790 is trying to acquire lock:
ffffffff8eaf4160 (console_owner){-.-.}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:2026 [inline]
ffffffff8eaf4160 (console_owner){-.-.}-{0:0}, at: vprintk_emit+0x4c0/0x6b0 kernel/printk/printk.c:2478
but task is already holding lock:
ffff88802b8c6790 (&p->pi_lock){-.-.}-{2:2}, at: task_call_func+0x8b/0x380 kernel/sched/core.c:4476
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&p->pi_lock){-.-.}-{2:2}:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:571 [inline]
try_to_wake_up+0xbd/0x1c90 kernel/sched/core.c:4292
__wake_up_common+0x135/0x1f0 kernel/sched/wait.c:108
__wake_up_common_lock kernel/sched/wait.c:125 [inline]
__wake_up+0x31/0x60 kernel/sched/wait.c:146
tty_port_default_wakeup+0x47/0x60 drivers/tty/tty_port.c:67
serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1723
serial8250_handle_irq_locked+0x770/0x9a0 drivers/tty/serial/8250/8250_port.c:1837
serial8250_handle_irq.part.0+0xb4/0x530 drivers/tty/serial/8250/8250_port.c:1853
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1849 [inline]
serial8250_default_handle_irq+0xc2/0x280 drivers/tty/serial/8250/8250_port.c:1867
serial8250_interrupt+0xf8/0x1b0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x232/0x880 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
handle_edge_irq+0x34c/0x950 kernel/irq/chip.c:859
generic_handle_irq_desc include/linux/irqdesc.h:188 [inline]
handle_irq arch/x86/kernel/irq.c:209 [inline]
call_irq_handler arch/x86/kernel/irq.c:265 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:280
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:273
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
rcu_read_lock include/linux/rcupdate.h:841 [inline]
page_table_check_clear+0x646/0x8f0 mm/page_table_check.c:77
__page_table_check_pte_clear+0xf1/0x100 mm/page_table_check.c:155
page_table_check_pte_clear include/linux/page_table_check.h:55 [inline]
ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1263 [inline]
get_and_clear_full_ptes include/linux/pgtable.h:879 [inline]
zap_present_folio_ptes mm/memory.c:1648 [inline]
zap_present_ptes mm/memory.c:1730 [inline]
do_zap_pte_range mm/memory.c:1832 [inline]
zap_pte_range mm/memory.c:1934 [inline]
zap_pmd_range mm/memory.c:2020 [inline]
zap_pud_range mm/memory.c:2048 [inline]
zap_p4d_range mm/memory.c:2069 [inline]
__zap_vma_range+0x2ccc/0x4a30 mm/memory.c:2109
unmap_vmas+0x299/0x5f0 mm/memory.c:2178
exit_mmap+0x1ef/0xa00 mm/mmap.c:1300
__mmput+0x12a/0x410 kernel/fork.c:1187
mmput+0x67/0x80 kernel/fork.c:1210
setup_new_exec+0x1d9/0x2a0 fs/exec.c:1353
load_elf_binary+0xa8f/0x51c0 fs/binfmt_elf.c:1024
search_binary_handler fs/exec.c:1694 [inline]
exec_binprm fs/exec.c:1726 [inline]
bprm_execve fs/exec.c:1778 [inline]
bprm_execve+0x8fb/0x1730 fs/exec.c:1754
do_execveat_common.isra.0+0x4a5/0x580 fs/exec.c:1876
__do_sys_execve fs/exec.c:1949 [inline]
__se_sys_execve fs/exec.c:1943 [inline]
__x64_sys_execve+0x93/0xd0 fs/exec.c:1943
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&tty->write_wait){-.-.}-{3:3}:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
__wake_up_common_lock kernel/sched/wait.c:124 [inline]
__wake_up+0x1c/0x60 kernel/sched/wait.c:146
tty_port_default_wakeup+0x47/0x60 drivers/tty/tty_port.c:67
serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1723
serial8250_handle_irq_locked+0x770/0x9a0 drivers/tty/serial/8250/8250_port.c:1837
serial8250_handle_irq.part.0+0xb4/0x530 drivers/tty/serial/8250/8250_port.c:1853
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1849 [inline]
serial8250_default_handle_irq+0xc2/0x280 drivers/tty/serial/8250/8250_port.c:1867
serial8250_interrupt+0xf8/0x1b0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x232/0x880 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
handle_edge_irq+0x34c/0x950 kernel/irq/chip.c:859
generic_handle_irq_desc include/linux/irqdesc.h:188 [inline]
handle_irq arch/x86/kernel/irq.c:209 [inline]
call_irq_handler arch/x86/kernel/irq.c:265 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:280
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:273
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:790 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline]
uart_write+0x29d/0xb20 drivers/tty/serial/serial_core.c:630
process_output_block drivers/tty/n_tty.c:557 [inline]
n_tty_write+0x431/0x1160 drivers/tty/n_tty.c:2366
iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
file_tty_write.isra.0+0x4d2/0x890 drivers/tty/tty_io.c:1081
tty_write drivers/tty/tty_io.c:1102 [inline]
redirected_tty_write drivers/tty/tty_io.c:1125 [inline]
redirected_tty_write+0xd4/0x120 drivers/tty/tty_io.c:1105
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&port_lock_key){-.-.}-{3:3}:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
uart_port_lock_irqsave include/linux/serial_core.h:719 [inline]
serial8250_console_write+0x177/0x1a50 drivers/tty/serial/8250/8250_port.c:3344
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
register_console.cold+0xc0/0x248 kernel/printk/printk.c:4208
univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515
console_init+0x3d5/0x5b0 kernel/printk/printk.c:4407
start_kernel+0x314/0x490 init/main.c:1112
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x158
-> #0 (console_owner){-.-.}-{0:0}:
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
console_trylock_spinning kernel/printk/printk.c:2026 [inline]
vprintk_emit+0x4d1/0x6b0 kernel/printk/printk.c:2478
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__report_bug.cold+0x34/0x141 lib/bug.c:248
report_bug+0xb2/0x220 lib/bug.c:286
handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436
exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:593
__set_task_frozen+0x211/0x2e0 kernel/freezer.c:139
task_call_func+0x169/0x380 kernel/sched/core.c:4495
__freeze_task kernel/freezer.c:150 [inline]
freeze_task+0x151/0x270 kernel/freezer.c:169
try_to_freeze_tasks+0x243/0x680 kernel/power/process.c:54
freeze_processes+0xf2/0x1f0 kernel/power/process.c:137
hibernate.cold+0xf0/0x6a2 kernel/power/hibernate.c:801
state_store+0x1ff/0x240 kernel/power/main.c:821
kobj_attr_store+0x58/0x80 lib/kobject.c:840
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
console_owner --> &tty->write_wait --> &p->pi_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&p->pi_lock);
lock(&tty->write_wait);
lock(&p->pi_lock);
lock(console_owner);
*** DEADLOCK ***
8 locks held by syz.7.70/6790:
#0: ffff88807f88eb70 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2aa/0x380 fs/file.c:1259
#1: ffff8880758ea450 (sb_writers#7){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
#2: ffff88802cf98880 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x2c2/0x5f0 fs/kernfs/file.c:336
#3: ffff8880202a1968 (kn->active#62){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline]
#3: ffff8880202a1968 (kn->active#62){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x332/0x5f0 fs/kernfs/file.c:337
#4: ffffffff8ea9fc80 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x56/0x70 kernel/power/main.c:71
#5: ffffffff8e80a098 (tasklist_lock){.+.+}-{3:3}, at: try_to_freeze_tasks+0x148/0x680 kernel/power/process.c:52
#6: ffffffff8ec181f8 (freezer_lock){....}-{3:3}, at: freeze_task+0x71/0x270 kernel/freezer.c:168
#7: ffff88802b8c6790 (&p->pi_lock){-.-.}-{2:2}, at: task_call_func+0x8b/0x380 kernel/sched/core.c:4476
stack backtrace:
CPU: 0 UID: 0 PID: 6790 Comm: syz.7.70 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
console_trylock_spinning kernel/printk/printk.c:2026 [inline]
vprintk_emit+0x4d1/0x6b0 kernel/printk/printk.c:2478
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__report_bug.cold+0x34/0x141 lib/bug.c:248
report_bug+0xb2/0x220 lib/bug.c:286
handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436
exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:593
RIP: 0010:__set_task_frozen+0x211/0x2e0 kernel/freezer.c:139
Code: 0f b6 04 02 84 c0 74 09 3c 03 7f 05 e8 18 9a 85 00 8b ab 98 0b 00 00 31 ff 89 ee e8 29 02 16 00 85 ed 74 09 e8 b0 07 16 00 90 <0f> 0b 90 e8 a7 07 16 00 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc90003d2f990 EFLAGS: 00010046
RAX: 0000000000080000 RBX: ffff88802b8c5d00 RCX: ffffc900200ea000
RDX: 0000000000080000 RSI: ffffffff81f44c10 RDI: ffff88807aa5be00
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88802b8c5d18
R13: 0000000000000002 R14: dffffc0000000000 R15: ffff88802b8c6778
task_call_func+0x169/0x380 kernel/sched/core.c:4495
__freeze_task kernel/freezer.c:150 [inline]
freeze_task+0x151/0x270 kernel/freezer.c:169
try_to_freeze_tasks+0x243/0x680 kernel/power/process.c:54
freeze_processes+0xf2/0x1f0 kernel/power/process.c:137
hibernate.cold+0xf0/0x6a2 kernel/power/hibernate.c:801
state_store+0x1ff/0x240 kernel/power/main.c:821
kobj_attr_store+0x58/0x80 lib/kobject.c:840
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f63e7f9e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f63e8e70028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f63e8225fa0 RCX: 00007f63e7f9e019
RDX: 0000000000000005 RSI: 0000200000000140 RDI: 0000000000000003
RBP: 00007f63e803500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f63e8226038 R14: 00007f63e8225fa0 R15: 00007fffbeef79e8
</TASK>
debug_locks && p->lockdep_depth
WARNING: kernel/freezer.c:139 at __set_task_frozen+0x211/0x2e0 kernel/freezer.c:139, CPU#0: syz.7.70/6790
Modules linked in:
CPU: 0 UID: 0 PID: 6790 Comm: syz.7.70 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__set_task_frozen+0x211/0x2e0 kernel/freezer.c:139
Code: 0f b6 04 02 84 c0 74 09 3c 03 7f 05 e8 18 9a 85 00 8b ab 98 0b 00 00 31 ff 89 ee e8 29 02 16 00 85 ed 74 09 e8 b0 07 16 00 90 <0f> 0b 90 e8 a7 07 16 00 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc90003d2f990 EFLAGS: 00010046
RAX: 0000000000080000 RBX: ffff88802b8c5d00 RCX: ffffc900200ea000
RDX: 0000000000080000 RSI: ffffffff81f44c10 RDI: ffff88807aa5be00
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88802b8c5d18
R13: 0000000000000002 R14: dffffc0000000000 R15: ffff88802b8c6778
FS: 00007f63e8e706c0(0000) GS:ffff888123dd9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70009556c8 CR3: 00000000551b8000 CR4: 0000000000350ef0
Call Trace:
<TASK>
task_call_func+0x169/0x380 kernel/sched/core.c:4495
__freeze_task kernel/freezer.c:150 [inline]
freeze_task+0x151/0x270 kernel/freezer.c:169
try_to_freeze_tasks+0x243/0x680 kernel/power/process.c:54
freeze_processes+0xf2/0x1f0 kernel/power/process.c:137
hibernate.cold+0xf0/0x6a2 kernel/power/hibernate.c:801
state_store+0x1ff/0x240 kernel/power/main.c:821
kobj_attr_store+0x58/0x80 lib/kobject.c:840
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f63e7f9e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f63e8e70028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f63e8225fa0 RCX: 00007f63e7f9e019
RDX: 0000000000000005 RSI: 0000200000000140 RDI: 0000000000000003
RBP: 00007f63e803500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f63e8226038 R14: 00007f63e8225fa0 R15: 00007fffbeef79e8
</TASK>
---
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