INFO: task syz.0.749:9906 blocked for more than 163 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.749 state:D stack:28432 pid:9906 tgid:9903 ppid:9197 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760
bdev_open+0xe0/0xd30 block/bdev.c:945
bdev_file_open_by_dev+0x1be/0x240 block/bdev.c:1059
setup_bdev_super+0x5a/0x5b0 fs/super.c:1610
get_tree_bdev_flags+0x366/0x4d0 fs/super.c:1690
vfs_get_tree+0x92/0x2b0 fs/super.c:1752
do_new_mount+0x2a2/0xa30 fs/namespace.c:3810
do_mount fs/namespace.c:4138 [inline]
__do_sys_mount fs/namespace.c:4349 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4326
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb2c8b8ebe9
RSP: 002b:00007fb2c6dd5038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb2c8db6180 RCX: 00007fb2c8b8ebe9
RDX: 0000200000000040 RSI: 0000200000000000 RDI: 00002000000000c0
RBP: 00007fb2c8c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb2c8db6218 R14: 00007fb2c8db6180 R15: 00007ffdc9ec17a8
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13613 Comm: syz.7.1552 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x2f/0x90 kernel/kcov.c:321
Code: 8b 04 24 65 48 8b 0c 25 08 10 c2 92 65 8b 15 68 7c 01 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 3c 16 00 00 00 <74> 4e 8b 91 18 16 00 00 83 fa 03 75 43 48 8b 91 20 16 00 00 44 8b
RSP: 0018:ffffc90000007a88 EFLAGS: 00000246
RAX: ffffffff899dbcc8 RBX: 00004189374bc6a7 RCX: ffff88807cfabc00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 00004189374bc6a7
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f54 R12: 00000015798ee228
R13: 0019999999999998 R14: ffff88804934b460 R15: 0000000225c17d04
FS: 00007f76a75dc6c0(0000) GS:ffff8881259ff000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76a6772020 CR3: 0000000069452000 CR4: 00000000003526f0
Call Trace:
pie_calculate_probability+0x208/0x7e0 net/sched/sch_pie.c:352
fq_pie_timer+0x288/0x5b0 net/sched/sch_fq_pie.c:402
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x58f/0x7a0 kernel/printk/printk.c:2449
Code: 85 32 01 00 00 e8 a1 81 1f 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 90 81 1f 00 eb 06 e8 89 81 1f 00 fb 48 c7 c7 80 02 33 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 b9 35
RSP: 0018:ffffc900039df6a0 EFLAGS: 00000287
RAX: ffffffff81a10d47 RBX: ffffffff81a10c04 RCX: 0000000000080000
RDX: ffffc9000c4ac000 RSI: 0000000000015c92 RDI: ffffffff8e330280
RBP: ffffc900039df7b0 R08: ffffffff8fc40337 R09: 1ffffffff1f88066
R10: dffffc0000000000 R11: fffffbfff1f88067 R12: dffffc0000000000
R13: 1ffff9200073bed8 R14: 0000000000000200 R15: 0000000000000043
_printk+0xcf/0x120 kernel/printk/printk.c:2475
f2fs_printk+0x464/0x500 fs/f2fs/super.c:-1
read_raw_super_block fs/f2fs/super.c:4418 [inline]
f2fs_fill_super+0xad4/0x7020 fs/f2fs/super.c:4907
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
vfs_get_tree+0x92/0x2b0 fs/super.c:1752
do_new_mount+0x2a2/0xa30 fs/namespace.c:3810
do_mount fs/namespace.c:4138 [inline]
__do_sys_mount fs/namespace.c:4349 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4326
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76a679038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f76a75dbe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f76a75dbef0 RCX: 00007f76a679038a
RDX: 0000200000000100 RSI: 0000200000000040 RDI: 00007f76a75dbeb0
RBP: 0000200000000100 R08: 00007f76a75dbef0 R09: 0000000002000410
R10: 0000000002000410 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f76a75dbeb0 R14: 000000000000555e R15: 0000200000001f80