INFO: task jfsCommit:128 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:jfsCommit state:D stack:29688 pid:128 tgid:128 ppid:2 task_flags:0x200040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
io_schedule+0x80/0xe0 kernel/sched/core.c:8150
folio_wait_bit_common+0x83c/0xbc0 mm/filemap.c:1324
txUnlock+0x23f/0xdb0 fs/jfs/jfs_txnmgr.c:931
txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline]
jfs_lazycommit+0x533/0xa20 fs/jfs/jfs_txnmgr.c:2735
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task kworker/u8:12:4763 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:kworker/u8:12 state:D stack:21304 pid:4763 tgid:4763 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-7:4)
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
io_schedule+0x80/0xe0 kernel/sched/core.c:8150
folio_wait_bit_common+0x83c/0xbc0 mm/filemap.c:1324
folio_lock include/linux/pagemap.h:1159 [inline]
writeback_get_folio mm/page-writeback.c:2435 [inline]
writeback_iter+0x957/0x1320 mm/page-writeback.c:2529
metapage_writepages+0x100/0x1a0 fs/jfs/jfs_metapage.c:558
do_writepages+0x338/0x560 mm/page-writeback.c:2571
__writeback_single_inode+0x12e/0xf90 fs/fs-writeback.c:1787
writeback_sb_inodes+0x9db/0x1ab0 fs/fs-writeback.c:2079
__writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2155
wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2266
wb_check_start_all fs/fs-writeback.c:2392 [inline]
wb_do_writeback fs/fs-writeback.c:2439 [inline]
wb_workfn+0x986/0x10f0 fs/fs-writeback.c:2477
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz.4.775:13120 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.4.775 state:D stack:27184 pid:13120 tgid:13105 ppid:8466 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
io_schedule+0x80/0xe0 kernel/sched/core.c:8150
folio_wait_bit_common+0x83c/0xbc0 mm/filemap.c:1324
folio_lock include/linux/pagemap.h:1159 [inline]
release_metapage+0x101/0xa50 fs/jfs/jfs_metapage.c:871
discard_metapage fs/jfs/jfs_metapage.h:88 [inline]
__get_metapage+0x9ac/0xdf0 fs/jfs/jfs_metapage.c:754
dtSearch+0x56c/0x2010 fs/jfs/jfs_dtree.c:621
jfs_lookup+0x1b0/0x420 fs/jfs/namei.c:1464
lookup_open fs/namei.c:4481 [inline]
open_last_lookups fs/namei.c:4608 [inline]
path_openat+0x1129/0x3850 fs/namei.c:4856
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_sys_openat2+0x115/0x200 fs/open.c:1395
do_sys_open fs/open.c:1401 [inline]
__do_sys_openat fs/open.c:1417 [inline]
__se_sys_openat fs/open.c:1412 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1412
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f411ce7ce59
RSP: 002b:00007f4112c94028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f411d0f6180 RCX: 00007f411ce7ce59
RDX: 000000000000275a RSI: 0000200000000200 RDI: ffffffffffffff9c
RBP: 00007f411cf12e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f411d0f6218 R14: 00007f411d0f6180 R15: 00007ffcb0676fb8
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 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+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
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: 16 Comm: ktimers/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:min_vruntime_update kernel/sched/fair.c:1012 [inline]
RIP: 0010:min_vruntime_cb_propagate kernel/sched/fair.c:1035 [inline]
RIP: 0010:rb_add_augmented_cached include/linux/rbtree_augmented.h:83 [inline]
RIP: 0010:__enqueue_entity+0x2b3/0xb40 kernel/sched/fair.c:1045
Code: 1e 95 00 48 8b 44 24 18 48 89 03 eb 0e 4d 8b 6d 00 49 83 e5 fc 0f 84 80 03 00 00 49 8d 7d 20 48 89 f8 48 c1 e8 03 48 89 04 24 <80> 3c 28 00 74 05 e8 72 1d 95 00 49 8b 45 20 48 89 44 24 28 49 8d
RSP: 0018:ffffc90000157940 EFLAGS: 00000802
RAX: 1ffffd1ffff90f76 RBX: ffff88803dfc5db0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe8ffffc87bb0
RBP: dffffc0000000000 R08: ffffe8ffffc95a67 R09: 0000000000000000
R10: ffffe8ffffc95a58 R11: fffff91ffff92b4d R12: ffff88803dfc5dc0
R13: ffffe8ffffc87b90 R14: ffff88803dfc5db8 R15: ffffe8ffffc95a80
FS: 0000000000000000(0000) GS:ffff88812615c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f447a70d000 CR3: 000000002bbc6000 CR4: 00000000003526f0
Call Trace:
enqueue_entity kernel/sched/fair.c:6157 [inline]
enqueue_task_fair+0xa97/0x2430 kernel/sched/fair.c:7857
enqueue_task+0x75/0x410 kernel/sched/core.c:2184
activate_task kernel/sched/core.c:2224 [inline]
ttwu_do_activate+0x1c8/0x640 kernel/sched/core.c:3824
ttwu_queue kernel/sched/core.c:4077 [inline]
try_to_wake_up+0x7b1/0x1430 kernel/sched/core.c:4415
hrtimer_wakeup+0x4e/0x60 kernel/time/hrtimer.c:2293
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2096
hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2113
handle_softirqs+0x1d9/0x6c0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
run_ktimerd+0x69/0x100 kernel/softirq.c:1151
smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245