INFO: task syz-executor.0:5452 blocked for more than 143 seconds.
Not tainted 6.9.0-rc3-next-20240412-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:26416 pid:5452 tgid:5451 ppid:5432 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0x17e8/0x4a50 kernel/sched/core.c:6746
__schedule_loop kernel/sched/core.c:6823 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6838
schedule_timeout+0xb0/0x310 kernel/time/timer.c:2558
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+0x355/0x620 kernel/sched/completion.c:148
__flush_workqueue+0x7d6/0x1710 kernel/workqueue.c:3959
nbd_start_device_ioctl drivers/block/nbd.c:1463 [inline]
__nbd_ioctl drivers/block/nbd.c:1524 [inline]
nbd_ioctl+0xbd1/0xf40 drivers/block/nbd.c:1564
blkdev_ioctl+0x580/0x6b0 block/ioctl.c:641
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:74 [inline]
do_syscall_64+0xfa/0x250 arch/x86/entry/common.c:105
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd3190780e9
RSP: 002b:00007fd31a1f30d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd31917bf60 RCX: 00007fd3190780e9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007fd3190d2c9b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd31917bf60 R15: 00007fff34534398
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e3340e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#0: ffffffff8e3340e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e3340e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by kworker/u9:1/4483:
#0: ffff88802098a148 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3193 [inline]
#0: ffff88802098a148 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3299
#1: ffffc9000e40fd00 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3194 [inline]
#1: ffffc9000e40fd00 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3299
2 locks held by getty/4839:
#0: ffff88801dc400a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.9.0-rc3-next-20240412-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xfde/0x1020 kernel/hung_task.c:380
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 35 Comm: kworker/u8:2 Not tainted 6.9.0-rc3-next-20240412-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4798 [inline]
RIP: 0010:__lock_acquire+0x876/0x1fd0 kernel/locking/lockdep.c:5087
Code: 8b 5d 00 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 a0 35 f7 92 be 08 00 00 00 e8 52 fb 88 00 48 0f a3 1d 2a 7a 84 11 <73> 1a 48 69 c3 c8 00 00 00 48 8d 98 a0 94 c5 92 48 ba 00 00 00 00
RSP: 0018:ffffc90000ab7330 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 000000000000000a RCX: ffffffff8172bb6e
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff92f735a0
RBP: 0000000000000003 R08: ffffffff92f735a7 R09: 1ffffffff25ee6b4
R10: dffffc0000000000 R11: fffffbfff25ee6b5 R12: 0000000000000004
R13: ffff88801b2e8ba0 R14: 0000000000000004 R15: ffff88801b2e8ba0
FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055599c1ed600 CR3: 000000000e132000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
__pte_offset_map+0x9e/0x380 mm/pgtable-generic.c:285
__pte_offset_map_lock+0xc7/0x300 mm/pgtable-generic.c:369
get_locked_pte include/linux/mm.h:2745 [inline]
__text_poke+0x2c5/0xd30 arch/x86/kernel/alternative.c:1883
text_poke arch/x86/kernel/alternative.c:1968 [inline]
text_poke_bp_batch+0x8cd/0xb30 arch/x86/kernel/alternative.c:2357
text_poke_flush arch/x86/kernel/alternative.c:2470 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2477
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205
static_key_enable+0x1a/0x20 kernel/jump_label.c:218
toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:826
process_one_work kernel/workqueue.c:3218 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3299
worker_thread+0x86d/0xd70 kernel/workqueue.c:3380
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244