INFO: task syz.0.2650:7267 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2650      state:D stack:27664 pid: 7267 ppid:  6989 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 perf_pending_task_sync+0x13c/0x1c0 kernel/events/core.c:5137
 _free_event+0x34/0xe30 kernel/events/core.c:5143
 put_event kernel/events/core.c:5268 [inline]
 perf_event_release_kernel+0x7c4/0x850 kernel/events/core.c:5393
 perf_release+0x37/0x40 kernel/events/core.c:5403
 __fput+0x212/0x8c0 fs/file_table.c:311
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x635/0x2100 kernel/exit.c:890
 do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
 __do_sys_exit_group kernel/exit.c:1015 [inline]
 __se_sys_exit_group kernel/exit.c:1013 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1013
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f207575b4d9
RSP: 002b:00007fffb0eee138 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f207575b4d9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fffb0eee19c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 00000000000000e9
R13: 00000000000927c0 R14: 00000000000333de R15: 00007fffb0eee1f0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/u4:2/155:
 #0: ffff8880b8f3a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:475
 #1: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:313
2 locks held by getty/3948:
 #0: ffff88802c8e7098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900026562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
1 lock held by syz.4.5954/11746:

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe1b/0xe60 kernel/hung_task.c:369
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11185 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:mark_lock+0x10/0x320 kernel/locking/lockdep.c:4625
Code: 4c 89 f7 41 89 d9 e9 79 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 50 89 d5 49 89 f6 <48> 89 fb 49 bd 00 00 00 00 00 fc ff df 83 fa 08 75 29 4d 8d 7e 20
RSP: 0018:ffffc90003e1f2c0 EFLAGS: 00000006
RAX: 0000000000000000 RBX: ffff88801e153b80 RCX: ffffffff815db004
RDX: 0000000000000006 RSI: ffff88801e154670 RDI: ffff88801e153b80
RBP: 0000000000000006 R08: ffffffff91047157 R09: 1ffffffff2208e2a
R10: dffffc0000000000 R11: fffffbfff2208e2b R12: ffff88801e154690
R13: 0000000000000000 R14: ffff88801e154670 R15: ffff88801e154670
FS:  0000555566b5f500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f105408b158 CR3: 0000000018fb0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mark_held_locks kernel/locking/lockdep.c:4260 [inline]
 __trace_hardirqs_on_caller kernel/locking/lockdep.c:4286 [inline]
 lockdep_hardirqs_on_prepare+0x380/0x7c0 kernel/locking/lockdep.c:4345
 trace_hardirqs_on+0x67/0x80 kernel/trace/trace_preemptirq.c:49
 kasan_quarantine_put+0xd4/0x210 mm/kasan/quarantine.c:231
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1710 [inline]
 slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736
 slab_free mm/slub.c:3504 [inline]
 kfree+0xef/0x2a0 mm/slub.c:4564
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:887 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1044 [inline]
 do_ip6t_get_ctl+0xe4b/0x1130 net/ipv6/netfilter/ip6_tables.c:1681
 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x43f/0x2390 net/ipv6/ipv6_sockglue.c:1492
 tcp_getsockopt+0x209/0x25e0 net/ipv4/tcp.c:4325
 __sys_getsockopt+0x1b0/0x230 net/socket.c:2257
 __do_sys_getsockopt net/socket.c:2272 [inline]
 __se_sys_getsockopt net/socket.c:2269 [inline]
 __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2269
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f1053e3ecca
Code: 48 83 ec 10 89 d2 48 63 ff 45 31 c9 6a 2a 45 31 c0 31 c9 e8 b8 99 fb ff 48 83 c4 18 c3 0f 1f 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7
RSP: 002b:00007fffbe507f88 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007fffbe508010 RCX: 00007f1053e3ecca
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007fffbe507fac R09: 0000000000000000
R10: 00007fffbe508010 R11: 0000000000000212 R12: 00007f105408cb80
R13: 00007fffbe507fac R14: 0000000000000000 R15: 00007f105408dfc0
 </TASK>