INFO: task syz-executor:5887 blocked for more than 143 seconds.
Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:14416 pid:5887 tgid:5887 ppid:1 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5366 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
__schedule_loop kernel/sched/core.c:6824 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6839
schedule_timeout+0xb1/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x360/0x630 kernel/sched/completion.c:148
kthread_stop+0x1a1/0x640 kernel/kthread.c:791
bch2_copygc_stop+0x4f/0x150 fs/bcachefs/movinggc.c:413
__bch2_fs_read_only+0x47/0x450 fs/bcachefs/super.c:265
bch2_fs_read_only+0xc80/0x1360 fs/bcachefs/super.c:356
__bch2_fs_stop+0x107/0x5b0 fs/bcachefs/super.c:634
generic_shutdown_super+0x13b/0x2d0 fs/super.c:642
bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2312
deactivate_locked_super+0xc6/0x130 fs/super.c:473
cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435
task_work_run+0x253/0x310 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f831f38e497
RSP: 002b:00007ffc889276d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f831f40e08c RCX: 00007f831f38e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc88927790
RBP: 00007ffc88927790 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc88928820
R13: 00007f831f40e08c R14: 000000000004908e R15: 00007ffc88928860
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8ed3a260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3a260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3a260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6761
5 locks held by kworker/u8:2/36:
3 locks held by kworker/u8:4/81:
#0: ffff88801b081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801b081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffff8880b8723b08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41f/0x7a0 kernel/sched/psi.c:987
#2: ffff8880b8739b18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:595
2 locks held by getty/5576:
#0: ffff8880353ba0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x53d/0x16b0 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/5887:
#0: ffff88807ee380e0 (&type->s_umount_key#68){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807ee380e0 (&type->s_umount_key#68){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807ee380e0 (&type->s_umount_key#68){+.+.}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
#1: ffff888051a80278 (&c->state_lock){+.+.}-{4:4}, at: __bch2_fs_stop+0xff/0x5b0 fs/bcachefs/super.c:633
5 locks held by kworker/u8:8/5967:
1 lock held by syz-executor/11878:
#0: ffffffff8ed3f778 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#0: ffffffff8ed3f778 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x454/0x830 kernel/rcu/tree_exp.h:998
1 lock held by syz.2.3878/15031:
#0: ffff88807f3020e0 (&type->s_umount_key#74/1){+.+.}-{4:4}, at: alloc_super+0x221/0x9d0 fs/super.c:344
2 locks held by syz.1.3885/15076:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7ab/0x920 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
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: 15048 Comm: syz.0.3882 Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:do_raw_spin_unlock+0x4/0x8b0 kernel/locking/spinlock_debug.c:139
Code: 8c 27 ff ff ff e8 ec f5 8b 00 e9 1d ff ff ff e8 32 a8 80 0a 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 <55> 41 57 41 56 41 55 41 54 53 48 83 ec 28 49 89 ff 48 bb 00 00 00
RSP: 0018:ffffc90000a08bc8 EFLAGS: 00000082
RAX: 39cf11bee03f1d00 RBX: ffff8880b8739b00 RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffffffff8e4ca585 RDI: ffff8880b8739b00
RBP: ffffc90000a08d08 R08: ffffffff905d3277 R09: 1ffffffff20ba64e
R10: dffffc0000000000 R11: fffffbfff20ba64f R12: ffff8880b8739b00
R13: 1ffff9200014118d R14: 1ffff110170e7526 R15: dffffc0000000000
FS: 00007f375b9026c0(0000) GS:ffff88812510f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f37583ff000 CR3: 000000004cf80000 CR4: 0000000000350ef0
Call Trace:
__raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186
raw_spin_rq_unlock kernel/sched/core.c:639 [inline]
rq_unlock kernel/sched/sched.h:1859 [inline]
ttwu_queue kernel/sched/core.c:3991 [inline]
try_to_wake_up+0x9c8/0x15d0 kernel/sched/core.c:4318
hrtimer_wakeup+0x62/0x80 kernel/time/hrtimer.c:2027
__run_hrtimer kernel/time/hrtimer.c:1791 [inline]
__hrtimer_run_queues+0x5a8/0xd40 kernel/time/hrtimer.c:1855
hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1917
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x167/0x2f0 arch/x86/include/asm/irqflags.h:-1
Code: c7 44 24 10 00 00 00 00 9c 8f 44 24 10 f7 44 24 10 00 02 00 00 0f 85 fd 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 48 8b 45 00 <48> 3b 44 24 38 0f 85 72 01 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000c817430 EFLAGS: 00000206
RAX: 39cf11bee03f1d00 RBX: ffffffff8ee3c860 RCX: 39cf11bee03f1d00
RDX: 0000000000000000 RSI: ffffffff8e4ca585 RDI: ffffffff8ca0f580
RBP: ffffffff93611020 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000246 R15: 0000000000000000
__fs_reclaim_acquire mm/page_alloc.c:3853 [inline]
fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3867
might_alloc include/linux/sched/mm.h:318 [inline]
prepare_alloc_pages+0x14a/0x5c0 mm/page_alloc.c:4513
__alloc_frozen_pages_noprof+0x181/0x7b0 mm/page_alloc.c:4729
alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301
folio_alloc_mpol_noprof+0x36/0x70 mm/mempolicy.c:2320
shmem_alloc_folio mm/shmem.c:1863 [inline]
shmem_alloc_and_add_folio+0x490/0x1070 mm/shmem.c:1902
shmem_get_folio_gfp+0x655/0x1800 mm/shmem.c:2545
shmem_get_folio mm/shmem.c:2651 [inline]
shmem_write_begin+0x17e/0x3a0 mm/shmem.c:3301
generic_perform_write+0x32b/0xa10 mm/filemap.c:4114
shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3477
new_sync_write fs/read_write.c:591 [inline]
vfs_write+0x711/0xd10 fs/read_write.c:684
ksys_write+0x19d/0x2d0 fs/read_write.c:736
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f375ab8bc1f
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:00007f375b901df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000008000000 RCX: 00007f375ab8bc1f
RDX: 0000000008000000 RSI: 00007f3750400000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000202ae
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000003
R13: 00007f375b901ef0 R14: 00007f375b901eb0 R15: 00007f3750400000