INFO: task syz-executor:5852 blocked for more than 143 seconds.
Not tainted 6.16.0-rc6-next-20250714-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20728 pid:5852 tgid:5852 ppid:1 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
schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2bf/0x5d0 kernel/sched/completion.c:153
kthread_stop+0x194/0x5f0 kernel/kthread.c:790
bch2_copygc_stop+0x4f/0x150 fs/bcachefs/movinggc.c:438
__bch2_fs_read_only+0x4a/0x4f0 fs/bcachefs/super.c:306
bch2_fs_read_only+0x3bc/0x940 fs/bcachefs/super.c:392
__bch2_fs_stop+0xc9/0x8a0 fs/bcachefs/super.c:703
generic_shutdown_super+0x135/0x2c0 fs/super.c:643
bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2624
deactivate_locked_super+0xb9/0x130 fs/super.c:474
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1378
task_work_run+0x1d1/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f16b6d8fc57
RSP: 002b:00007fff00027468 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f16b6e10925 RCX: 00007f16b6d8fc57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff00027520
RBP: 00007fff00027520 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff000285b0
R13: 00007f16b6e10925 R14: 00000000000179be R15: 00007fff000285f0
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13eca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13eca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13eca0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
3 locks held by udevd/5219:
2 locks held by getty/5608:
#0: ffff88814dc160a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/5852:
#0: ffff88805575c0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88805575c0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88805575c0e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506
#1: ffff888057800278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xc1/0x8a0 fs/bcachefs/super.c:702
1 lock held by syz-executor/5863:
#0: ffff88802e8000e0 (&type->s_umount_key#64){++++}-{4:4}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffff88802e8000e0 (&type->s_umount_key#64){++++}-{4:4}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffff88802e8000e0 (&type->s_umount_key#64){++++}-{4:4}, at: find_lock_entries+0x10d/0xa60 mm/filemap.c:2140
2 locks held by bch-copygc/loop/5987:
#0: ffff8880578043a8 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#0: ffff8880578043a8 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#0: ffff8880578043a8 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0xaf/0x220 fs/bcachefs/btree_iter.c:3300
#1: ffff888057826710 (&c->gc_lock){.+.+}-{4:4}, at: bch2_btree_update_start+0x542/0x1de0 fs/bcachefs/btree_update_interior.c:1208
2 locks held by udevd/6761:
#0: ffff8880b8739f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606
#1: ffffffff8e259fc0 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e259fc0 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e259fc0 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: is_bpf_text_address+0x26/0x2b0 kernel/bpf/core.c:776
1 lock held by syz.7.873/9199:
#0: ffffffff8e1447f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#0: ffffffff8e1447f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:967
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc6-next-20250714-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+0x70e/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: 5927 Comm: kworker/1:4 Not tainted 6.16.0-rc6-next-20250714-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: 0x0 (events)
RIP: 0010:cpu_of kernel/sched/sched.h:1307 [inline]
RIP: 0010:update_rq_clock_pelt kernel/sched/pelt.h:124 [inline]
RIP: 0010:update_rq_clock_task kernel/sched/core.c:796 [inline]
RIP: 0010:update_rq_clock+0x306/0x5b0 kernel/sched/core.c:821
Code: 01 00 00 41 f6 07 02 0f 85 be 00 00 00 41 0f b6 04 2c 84 c0 0f 85 ab 01 00 00 41 8b 3e e8 42 42 da ff 49 89 c7 41 0f b6 04 2c <84> c0 0f 85 b1 01 00 00 45 8b 36 49 83 fe 08 0f 83 c2 01 00 00 4d
RSP: 0018:ffffc900045979d8 EFLAGS: 00000093
RAX: 0000000000000000 RBX: ffff8880b8739f80 RCX: ffff88802bfbda00
RDX: 0000000000000000 RSI: 0000000000010254 RDI: 0000000000000001
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520008b2f2c R12: 1ffff110170e7575
R13: 0000000000000000 R14: ffff8880b873aba8 R15: 0000000000000400
FS: 0000000000000000(0000) GS:ffff888125ced000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555575e465c8 CR3: 0000000077ab2000 CR4: 00000000003526f0
Call Trace:
__schedule+0x42e/0x4d00 kernel/sched/core.c:6626
__schedule_loop kernel/sched/core.c:6775 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6790
worker_thread+0xa82/0xda0 kernel/workqueue.c:3418
kthread+0x70e/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