INFO: task syz.9.627:8693 blocked for more than 143 seconds.
Not tainted 6.16.0-rc5-next-20250711-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.627 state:D stack:23352 pid:8693 tgid:8692 ppid:7327 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5314 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6697
__schedule_loop kernel/sched/core.c:6775 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6790
io_schedule+0x80/0xd0 kernel/sched/core.c:7635
folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1114 [inline]
release_metapage+0x103/0xac0 fs/jfs/jfs_metapage.c:868
discard_metapage fs/jfs/jfs_metapage.h:88 [inline]
__get_metapage+0x9a0/0xde0 fs/jfs/jfs_metapage.c:751
dtReadFirst+0xd5/0x930 fs/jfs/jfs_dtree.c:3079
dtReadNext fs/jfs/jfs_dtree.c:3160 [inline]
jfs_readdir+0x8ed/0x3ae0 fs/jfs/jfs_dtree.c:2874
wrap_directory_iterator+0x93/0xe0 fs/readdir.c:65
iterate_dir+0x396/0x570 fs/readdir.c:108
__do_sys_getdents64 fs/readdir.c:410 [inline]
__se_sys_getdents64+0xe4/0x260 fs/readdir.c:396
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fedbcb8e929
RSP: 002b:00007fedba9f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fedbcdb5fa0 RCX: 00007fedbcb8e929
RDX: 00000000000000ae RSI: 00002000000002c0 RDI: 0000000000000005
RBP: 00007fedbcc10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fedbcdb5fa0 R15: 00007ffd69ca8788
Showing all locks held in the system:
1 lock held by ksoftirqd/1/23:
1 lock held by khungtaskd/31:
#0: ffffffff8e13c5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13c5a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13c5a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by kworker/u8:6/2977:
2 locks held by getty/5611:
#0: ffff8880347d60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by syz-executor/5853:
2 locks held by udevd/6385:
4 locks held by kworker/u8:12/7993:
2 locks held by syz.9.627/8693:
#0: ffff88801dedc638 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1232
#1: ffff88805a995870 (&type->i_mutex_dir_key#13){++++}-{4:4}, at: wrap_directory_iterator+0x5a/0xe0 fs/readdir.c:54
2 locks held by syz.6.1012/10303:
#0: ffffffff8e891428 (bio_slab_lock){+.+.}-{4:4}, at: bio_put_slab block/bio.c:140 [inline]
#0: ffffffff8e891428 (bio_slab_lock){+.+.}-{4:4}, at: bioset_exit+0x44a/0x690 block/bio.c:1764
#1: ffffffff8e141fc0 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570 kernel/rcu/tree.c:3794
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc5-next-20250711-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:328 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:491
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7993 Comm: kworker/u8:12 Not tainted 6.16.0-rc5-next-20250711-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: iou_exit io_ring_exit_work
RIP: 0010:filter_irq_stacks+0x2d/0xa0 kernel/stacktrace.c:397
Code: fa 41 57 41 56 41 55 41 54 53 85 f6 74 70 49 89 fe 41 89 f4 31 db 49 bd 00 00 00 00 00 fc ff df 49 89 ff 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 34 e7 77 00 49 8b 04 de 48 3d 30
RSP: 0018:ffffc9000bbef538 EFLAGS: 00000a06
RAX: 1ffff9200177debe RBX: 0000000000000002 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 000000000000000b RDI: ffffc9000bbef5e0
RBP: ffffc9000bbef810 R08: 0000000000000015 R09: ffffffff81729ea5
R10: ffffc9000bbef4f8 R11: ffffffff81ac7b20 R12: 000000000000000b
R13: dffffc0000000000 R14: ffffc9000bbef5e0 R15: ffffc9000bbef5f0
FS: 0000000000000000(0000) GS:ffff888125cc6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555586c1c608 CR3: 000000000df36000 CR4: 00000000003526f0
Call Trace:
stack_depot_save_flags+0x40/0x900 lib/stackdepot.c:610
kasan_save_stack+0x4d/0x60 mm/kasan/common.c:48
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
slab_free_hook mm/slub.c:2378 [inline]
slab_free mm/slub.c:4680 [inline]
kmem_cache_free+0x2f6/0x400 mm/slub.c:4782
__io_req_caches_free+0x8f/0x140 io_uring/io_uring.c:2774
io_req_caches_free+0x21/0x30 io_uring/io_uring.c:2786
io_ring_exit_work+0x415/0x930 io_uring/io_uring.c:2984
process_one_work kernel/workqueue.c:3239 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3322
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245