INFO: task syz.1.459:9330 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.459 state:D stack:27112 pid:9330 tgid:9323 ppid:5803 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
io_schedule+0x81/0xe0 kernel/sched/core.c:7871
TXN_SLEEP_DROP_LOCK fs/jfs/jfs_txnmgr.c:125 [inline]
txBegin+0x26e/0xb10 fs/jfs/jfs_txnmgr.c:375
jfs_truncate_nolock+0x170/0x340 fs/jfs/inode.c:386
jfs_truncate+0xce/0x140 fs/jfs/inode.c:420
jfs_setattr+0x4f8/0x760 fs/jfs/file.c:122
notify_change+0xc18/0xf60 fs/attr.c:546
do_truncate+0x1a4/0x220 fs/open.c:68
vfs_truncate+0x493/0x520 fs/open.c:118
do_sys_truncate+0xdb/0x190 fs/open.c:141
__do_sys_truncate fs/open.c:153 [inline]
__se_sys_truncate fs/open.c:151 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:151
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: 0033:0x7f250dd5f749
RSP: 002b:00007f250bf9d038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f250dfb6090 RCX: 00007f250dd5f749
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00002000000000c0
RBP: 00007f250dde3f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f250dfb6128 R14: 00007f250dfb6090 R15: 00007ffc8d2d2d68
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8d5aa880 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:9/3232:
#0: ffff88813ff69938 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff88813ff69938 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
#1: ffffc9000d6bfba0 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc9000d6bfba0 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
2 locks held by kworker/u8:10/3594:
#0: ffff88813ff69938 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff88813ff69938 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
#1: ffffc9000de4fba0 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc9000de4fba0 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
2 locks held by getty/5559:
#0: ffff88823bf2e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1400 drivers/tty/n_tty.c:2222
3 locks held by syz.1.459/9330:
#0: ffff8880627e4480 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff88804a63c038 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:985 [inline]
#1: ffff88804a63c038 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
#2: ffff88804a63bbe8 (&jfs_ip->rdwrlock#2){++++}-{4:4}, at: jfs_truncate+0xb2/0x140 fs/jfs/inode.c:419
5 locks held by syz-executor/9707:
3 locks held by udevd/9822:
3 locks held by syz.7.618/10721:
3 locks held by syz.5.619/10725:
2 locks held by syz.8.621/10728:
1 lock held by dhcpcd-run-hook/10730:
2 locks held by syz.4.622/10733:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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+0x4bc/0x870 arch/x86/kernel/process.c:158
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: 10728 Comm: syz.8.621 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:229 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4879 [inline]
RIP: 0010:__lock_acquire+0x4ff/0xd20 kernel/locking/lockdep.c:5187
Code: 44 89 e0 48 ff c3 48 63 8f 58 0b 00 00 49 83 c7 28 41 89 c4 48 39 cb 0f 8d d6 00 00 00 48 83 fb 31 0f 83 92 00 00 00 41 8b 07 <25> ff 1f 00 00 48 0f a3 05 34 5e 0e 11 73 10 48 69 c0 c8 00 00 00
RSP: 0018:ffffc9000ce6f7b0 EFLAGS: 00000083
RAX: 00000000000408c9 RBX: 0000000000000001 RCX: 0000000000000002
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff88803085bc00
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ac2db41
R10: 0000000000000000 R11: fffffbfff1dac84f R12: 00000000ffffff05
R13: 0000000000000001 R14: ffff88803085c7b0 R15: ffff88803085c7a8
FS: 00007fa33bcc66c0(0000) GS:ffff888126ef6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4d90af7d0 CR3: 000000005e34a000 CR4: 00000000003526f0
Call Trace:
reacquire_held_locks+0x127/0x1d0 kernel/locking/lockdep.c:5385
__lock_release kernel/locking/lockdep.c:5574 [inline]
lock_release+0x1b4/0x3e0 kernel/locking/lockdep.c:5889
rt_spin_unlock+0x29/0x200 kernel/locking/spinlock_rt.c:80
spin_unlock include/linux/spinlock_rt.h:105 [inline]
shmem_recalc_inode mm/shmem.c:462 [inline]
shmem_alloc_and_add_folio mm/shmem.c:1970 [inline]
shmem_get_folio_gfp+0xb49/0x1a70 mm/shmem.c:2535
shmem_get_folio mm/shmem.c:2641 [inline]
shmem_write_begin+0xef/0x2a0 mm/shmem.c:3291
generic_perform_write+0x29d/0x8c0 mm/filemap.c:4254
shmem_file_write_iter+0xfb/0x120 mm/shmem.c:3466
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5d5/0xb40 fs/read_write.c:686
ksys_write+0x14b/0x260 fs/read_write.c:738
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: 0033:0x7fa33da5e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa33bcc5df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007fa33da5e1ff
RDX: 0000000001000000 RSI: 00007fa3338a6000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000978d
R10: 0000200000012f42 R11: 0000000000000293 R12: 0000000000000003
R13: 00007fa33bcc5ef0 R14: 00007fa33bcc5eb0 R15: 00007fa3338a6000