INFO: task syz-executor:5791 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21800 pid:5791 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x15ae/0x4700 kernel/sched/core.c:6722
schedule+0xbd/0x170 kernel/sched/core.c:6796
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
gfs2_gl_hash_clear+0x1ac/0x450 fs/gfs2/glock.c:2256
gfs2_put_super+0x8bb/0x930 fs/gfs2/super.c:652
generic_shutdown_super+0x134/0x2b0 fs/super.c:690
kill_block_super+0x44/0x90 fs/super.c:1671
deactivate_locked_super+0x9c/0x210 fs/super.c:479
cleanup_mnt+0x3d7/0x460 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
__syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:305
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f09f0da0797
RSP: 002b:00007ffe13f54cc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000064 RCX: 00007f09f0da0797
RDX: 0000000000000200 RSI: 0000000000000009 RDI: 00007ffe13f55e70
RBP: 00007f09f0e35f63 R08: 0000000000010590 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000202 R12: 00007ffe13f55e70
R13: 00007f09f0e35f63 R14: 000055555f3114e8 R15: 00007ffe13f56f40
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6669
2 locks held by khugepaged/35:
2 locks held by kworker/0:2/174:
#0: ffff888018c72d38 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#0: ffff888018c72d38 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
#1: ffffc90002ed7d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#1: ffffc90002ed7d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
1 lock held by syz-executor/5791:
#0: ffff8880326420e0 (&type->s_umount_key#56){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880326420e0 (&type->s_umount_key#56){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880326420e0 (&type->s_umount_key#56){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:510
1 lock held by syz-executor/6793:
#0: ffffffff8e137cb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#0: ffffffff8e137cb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x306/0x880 kernel/rcu/tree_exp.h:1004
2 locks held by getty/7639:
#0: ffff8880336fa0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900039c32f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x428/0x1370 drivers/tty/n_tty.c:2217
3 locks held by syz.9.1408/11192:
1 lock held by syz.7.1411/11208:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 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+0xf59/0xfa0 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11191 Comm: syz.9.1408 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:clac arch/x86/include/asm/uaccess_64.h:112 [inline]
RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:120 [inline]
RIP: 0010:raw_copy_from_user arch/x86/include/asm/uaccess_64.h:127 [inline]
RIP: 0010:__copy_from_user include/linux/uaccess.h:102 [inline]
RIP: 0010:check_xstate_in_sigframe arch/x86/kernel/fpu/signal.c:35 [inline]
RIP: 0010:__fpu_restore_sig arch/x86/kernel/fpu/signal.c:348 [inline]
RIP: 0010:fpu__restore_sig+0x246/0x1210 arch/x86/kernel/fpu/signal.c:493
Code: e8 8f df 2d 03 84 c0 74 07 e8 96 5e 55 00 eb 3f 48 8d b3 d0 01 00 00 0f 01 cb b9 30 00 00 00 4c 89 ff e8 4d 79 57 09 49 89 ce <0f> 01 ca 31 ff 48 89 ce e8 ad 62 55 00 4d 85 f6 0f 84 a1 00 00 00
RSP: 0018:ffffc9000b8e7b20 EFLAGS: 00040246
RAX: 0000000000000000 RBX: 00007fffc2e33c80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00007fffc2e33e80 RDI: ffffc9000b8e7c80
RBP: ffffc9000b8e7cf0 R08: ffffc9000b8e7c7f R09: 1ffff9200171cf8f
R10: dffffc0000000000 R11: fffff5200171cf90 R12: 1ffff9200171cf74
R13: 00007fffc2e33c80 R14: 0000000000000000 R15: ffffc9000b8e7c50
FS: 000055555b46e500(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556e1874e8 CR3: 000000004fed6000 CR4: 00000000003506f0
Call Trace:
restore_sigcontext arch/x86/kernel/signal_64.c:95 [inline]
__ia32_sys_rt_sigreturn+0x6d1/0x850 arch/x86/kernel/signal_64.c:266
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f16c866f8e4
Code: 4c 89 e6 eb 09 90 48 8b 4b 08 48 83 c3 08 48 39 d1 72 f3 48 8d 46 f8 48 8b 76 f8 48 39 f2 73 13 66 0f 1f 44 00 00 48 8b 70 f8 <48> 83 e8 08 48 39 f2 72 f3 48 39 c3 73 3e 48 89 33 48 89 c6 48 83
RSP: 002b:00007fffc2e34050 EFLAGS: 00000293
RAX: 00007f16c8204238 RBX: 00007f16c8200fb0 RCX: ffffffff813be9e0
RDX: ffffffff813241a0 RSI: ffffffff813bfb5e RDI: 00007f16c8203ed8
RBP: 00007f16c81ff008 R08: 00007f16c8a10000 R09: 00007f16c8a26038
R10: 0000000000000003 R11: 000000000000000c R12: 00007f16c8208da8
R13: 0000000000000019 R14: 00000000000013b4 R15: 0000000000000003