INFO: task syz-executor:2830 blocked for more than 143 seconds.
Not tainted 6.7.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:11288 pid:2830 tgid:2830 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x691/0x970 kernel/sched/core.c:6688
__schedule_loop kernel/sched/core.c:6763 [inline]
schedule+0xab/0x110 kernel/sched/core.c:6778
__bch2_fs_stop+0x217/0x370 fs/bcachefs/super.c:629
generic_shutdown_super+0x71/0x110 fs/super.c:696
bch2_kill_sb+0x11/0x20 fs/bcachefs/fs.c:1972
deactivate_locked_super+0x33/0x110 fs/super.c:484
cleanup_mnt+0xe2/0x120 fs/namespace.c:1256
task_work_run+0x81/0xb0 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xa9/0xc0 kernel/entry/common.c:171
exit_to_user_mode_prepare+0x64/0xb0 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x2c/0x1e0 kernel/entry/common.c:296
do_syscall_64+0x5c/0x120 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fadb387e297
RSP: 002b:00007ffe70ad54d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fadb387e297
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe70ad5590
RBP: 00007ffe70ad5590 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe70ad6640
R13: 00007fadb38d9636 R14: 000000000000d8e8 R15: 0000000000000000
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8377ec40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#0: ffffffff8377ec40 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#0: ffffffff8377ec40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x30/0x100 kernel/locking/lockdep.c:6614
2 locks held by getty/1387:
#0: ffff8881092920a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x40 drivers/tty/tty_ldisc.c:243
#1: ffffc90002a9b2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x242/0x910 drivers/tty/n_tty.c:2201
1 lock held by syz-executor/2830:
#0: ffff8881016ca0e0 (&type->s_umount_key#50){....}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8881016ca0e0 (&type->s_umount_key#50){....}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8881016ca0e0 (&type->s_umount_key#50){....}-{3:3}, at: deactivate_super+0x2f/0x40 fs/super.c:516
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x83/0xd0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x146/0x160 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x8e/0x140 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0x5da/0x600 kernel/hung_task.c:379
kthread+0xe9/0x100 kernel/kthread.c:388
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 844 Comm: kworker/u4:5 Not tainted 6.7.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:__default_send_IPI_dest_field+0x3e/0x60 arch/x86/kernel/apic/ipi.c:186
Code: 5f ff 00 10 00 00 74 0f f3 90 f7 04 25 00 c3 5f ff 00 10 00 00 75 f1 c1 e5 18 89 2c 25 10 c3 5f ff 09 de 89 34 25 00 c3 5f ff <5b> 5d c3 cc cc cc cc e8 16 ff ff ff be 00 04 00 00 eb da 66 2e 0f
RSP: 0018:ffffc90001a5bc00 EFLAGS: 00000002
RAX: 56a0853c27e32300 RBX: 0000000000000800 RCX: ffff88810367b700
RDX: 0000000000000800 RSI: 00000000000008fb RDI: 0000000000000002
RBP: 0000000002000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff81065a20 R12: ffffffff8103d420
R13: ffff888237d34380 R14: 0000000000000000 R15: ffff888237c2fc80
FS: 0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557cb7c5baa0 CR3: 0000000003644000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
_flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:36 [inline]
flat_send_IPI_mask+0x34/0x80 arch/x86/kernel/apic/apic_flat_64.c:44
arch_send_call_function_single_ipi arch/x86/include/asm/smp.h:101 [inline]
send_call_function_single_ipi kernel/smp.c:117 [inline]
smp_call_function_many_cond+0x57a/0xae0 kernel/smp.c:837
on_each_cpu_cond_mask+0x3a/0x70 kernel/smp.c:1023
text_poke_bp_batch+0x2c3/0x310
text_poke_flush arch/x86/kernel/alternative.c:2417 [inline]
text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:2424
arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked kernel/jump_label.c:235 [inline]
static_key_disable+0x3f/0x60 kernel/jump_label.c:243
toggle_allocation_gate+0xe2/0x130 mm/kfence/core.c:835
process_one_work kernel/workqueue.c:2627 [inline]
process_scheduled_works+0x250/0x4d0 kernel/workqueue.c:2700
worker_thread+0x23d/0x300 kernel/workqueue.c:2781
kthread+0xe9/0x100 kernel/kthread.c:388
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242