INFO: task syz-executor:5832 blocked for more than 143 seconds.
Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20968 pid:5832 tgid:5832 ppid:1 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6840
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: 0033:0x7f12d558e497
RSP: 002b:00007ffffb55f618 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f12d560e08c RCX: 00007f12d558e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffffb55f6d0
RBP: 00007ffffb55f6d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffffb560760
R13: 00007f12d560e08c R14: 00000000000266ae R15: 00007ffffb5607a0
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8eb3a760 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8eb3a760 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8eb3a760 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6761
2 locks held by kworker/u8:3/58:
#0: ffff8880b8639ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:595
#1: ffffc9000102fc60 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc9000102fc60 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
2 locks held by getty/5578:
#0: ffff88814d6980a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fd62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x53d/0x16b0 drivers/tty/n_tty.c:2211
3 locks held by udevd/5829:
2 locks held by syz-executor/5832:
#0: ffff88807df4c0e0 (&type->s_umount_key#71){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807df4c0e0 (&type->s_umount_key#71){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807df4c0e0 (&type->s_umount_key#71){+.+.}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
#1: ffff888052400278 (&c->state_lock){+.+.}-{4:4}, at: __bch2_fs_stop+0xff/0x5b0 fs/bcachefs/super.c:633
3 locks held by udevd/5833:
2 locks held by udevd/5843:
#0: ffff888073d0c420 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556
#1: ffff888031b92370 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:902 [inline]
#1: ffff888031b92370 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: do_unlinkat+0x26c/0x7b0 fs/namei.c:4595
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 58 Comm: kworker/u8:3 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:217 [inline]
RIP: 0010:unwind_next_frame+0x1cb/0x22f0 arch/x86/kernel/unwind_orc.c:494
Code: 73 e7 0c 00 0f 45 d1 8d 42 ff 44 39 f0 0f 86 74 18 00 00 44 89 f0 48 8d 1c 85 d0 f3 6d 91 48 89 d8 48 c1 e8 03 42 0f b6 04 20 <84> c0 4c 89 e5 0f 85 b6 1a 00 00 44 8b 23 44 89 f0 ff c0 48 8d 1c
RSP: 0018:ffffc9000102eef0 EFLAGS: 00000213
RAX: 0000000000000000 RBX: ffffffff917273d4 RCX: 00000000000b1e93
RDX: 00000000000b1e93 RSI: ffffffff8220014f RDI: 0000000000000001
RBP: ffffc9000102eff5 R08: 0000000000000007 R09: ffffc9000102f0b0
R10: dffffc0000000000 R11: ffffffff81aed460 R12: dffffc0000000000
R13: ffffc9000102efc0 R14: 0000000000012001 R15: ffffffff8220014e
FS: 0000000000000000(0000) GS:ffff888125224000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fddf06e8416 CR3: 000000007c066000 CR4: 0000000000350ef0
Call Trace:
arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
save_stack+0xfc/0x1f0 mm/page_owner.c:156
__set_page_owner+0x90/0x540 mm/page_owner.c:320
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
prep_new_page mm/page_alloc.c:1559 [inline]
get_page_from_freelist+0x3695/0x37e0 mm/page_alloc.c:3477
__alloc_frozen_pages_noprof+0x2c5/0x7b0 mm/page_alloc.c:4740
alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2446 [inline]
allocate_slab+0x8f/0x3a0 mm/slub.c:2610
new_slab mm/slub.c:2663 [inline]
___slab_alloc+0xc3b/0x1500 mm/slub.c:3849
__slab_alloc+0x58/0xa0 mm/slub.c:3939
__slab_alloc_node mm/slub.c:4014 [inline]
slab_alloc_node mm/slub.c:4175 [inline]
__do_kmalloc_node mm/slub.c:4317 [inline]
__kmalloc_node_track_caller_noprof+0x2ef/0x4d0 mm/slub.c:4337
kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:537
__alloc_skb+0x1f2/0x480 net/core/skbuff.c:606
alloc_skb include/linux/skbuff.h:1331 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x260/0xb50 drivers/net/netdevsim/dev.c:851
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac5/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd30 kernel/workqueue.c:3400
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