INFO: task syz.2.3:6000 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3 state:D stack:23016 pid:6000 tgid:5998 ppid:5838 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
__closure_sync+0x163/0x220 lib/closure.c:146
closure_sync include/linux/closure.h:195 [inline]
bch2_direct_IO_read fs/bcachefs/fs-io-direct.c:180 [inline]
bch2_read_iter+0x1044/0x1450 fs/bcachefs/fs-io-direct.c:215
do_iter_readv_writev+0x62b/0x8d0 fs/read_write.c:-1
vfs_readv+0x259/0x850 fs/read_write.c:1018
do_preadv fs/read_write.c:1132 [inline]
__do_sys_preadv2 fs/read_write.c:1191 [inline]
__se_sys_preadv2+0x17c/0x2a0 fs/read_write.c:1182
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: 0033:0x7ff8cfc9eec9
RSP: 002b:00007ff8cdefe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000147
RAX: ffffffffffffffda RBX: 00007ff8cfef5fa0 RCX: 00007ff8cfc9eec9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007ff8cfd21f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8cfef6038 R14: 00007ff8cfef5fa0 R15: 00007ffee55d1bb8
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:9/1537:
2 locks held by getty/5603:
#0: ffff88823bf368a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e832e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1410 drivers/tty/n_tty.c:2222
5 locks held by udevd/6005:
1 lock held by syz-executor/6680:
1 lock held by syz-executor/7002:
1 lock held by syz.0.248/7860:
#0: ffff8880291ba0d0 (&type->s_umount_key#50/1){+.+.}-{4:4}, at: alloc_super+0x204/0x990 fs/super.c:345
4 locks held by syz.4.249/7868:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x436/0x7d0 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: 6005 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__bfs kernel/locking/lockdep.c:1753 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain+0xe7d/0x2140 kernel/locking/lockdep.c:3908
Code: 00 00 0f 83 89 01 00 00 4e 8b 2c fd c0 77 fe 94 ff c0 25 ff 0f 00 00 89 05 e0 9f 62 13 4d 85 ed 0f 84 a7 01 00 00 49 8b 45 10 <48> 85 c0 0f 84 bb 0b 00 00 8b 0d cc 9f 62 13 39 48 5c 0f 84 6e ff
RSP: 0018:ffffc90005bc71f8 EFLAGS: 00000082
RAX: ffffffff929f8da0 RBX: 00000000000003cd RCX: ffffffff959277a8
RDX: 0000000000000008 RSI: 00000000000003cd RDI: ffff88802fd18000
RBP: ffffffff92a891a0 R08: ffffc90005bc71c0 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff819c7440 R12: ffffffff959fad18
R13: ffffffff959277a8 R14: ffff88802fd18be8 R15: 00000000000000ce
FS: 00007fe021db9880(0000) GS:ffff8881268bc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc9dfc86000 CR3: 00000000377a6000 CR4: 00000000003526f0
Call Trace:
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:477 [inline]
do_write_seqcount_begin include/linux/seqlock.h:503 [inline]
psi_write_begin+0xab/0x160 kernel/sched/psi.c:183
psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
psi_sched_switch kernel/sched/stats.h:220 [inline]
__schedule+0x2243/0x4c20 kernel/sched/core.c:6955
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 1b 3c 5a 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90005bc7860 EFLAGS: 00000206
RAX: a2f3392f10504000 RBX: 0000000000000000 RCX: a2f3392f10504000
RDX: 0000000000000000 RSI: ffffffff8d21af85 RDI: ffffffff8b621680
RBP: ffffffff8af95c4b R08: 0000000000000000 R09: ffffffff8af95c4b
R10: dffffc0000000000 R11: fffffbfff1e3ac67 R12: 0000000000000002
R13: ffffffff8d9a8d80 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
rt_spin_lock+0x1d7/0x2c0 kernel/locking/spinlock_rt.c:57
spin_lock_irq include/linux/spinlock_rt.h:93 [inline]
clear_inode+0x2d/0x190 fs/inode.c:752
shmem_evict_inode+0x9a8/0xa70 mm/shmem.c:1421
evict+0x501/0x9c0 fs/inode.c:810
__dentry_kill+0x209/0x660 fs/dcache.c:669
dput+0x19f/0x2b0 fs/dcache.c:911
do_renameat2+0x6de/0xa80 fs/namei.c:5280
__do_sys_rename fs/namei.c:5325 [inline]
__se_sys_rename fs/namei.c:5323 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5323
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: 0033:0x7fe021e7acc7
Code: e8 5e a7 09 00 f7 d8 19 c0 5b c3 0f 1f 84 00 00 00 00 00 b8 ff ff ff ff 5b c3 66 0f 1f 84 00 00 00 00 00 b8 52 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 01 61 17 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffee429ae38 EFLAGS: 00000206 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00005579115357a0 RCX: 00007fe021e7acc7
RDX: 0000557911518010 RSI: 00007ffee429ae50 RDI: 00007ffee429b250
RBP: 00005579115417c0 R08: 00000000000001e0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffee429ae50
R13: 00007ffee429b250 R14: 0000000000000000 R15: 000055791152d520