INFO: task syz-executor.0:14745 blocked for more than 143 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26760 pid:14745 ppid: 6582 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1176 [inline] io_wq_put_and_exit+0x4b2/0xd20 fs/io-wq.c:1211 io_uring_clean_tctx fs/io_uring.c:9675 [inline] io_uring_cancel_generic+0x5fe/0x740 fs/io_uring.c:9755 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f7a5901f739 RSP: 002b:00007f7a56575188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000800 RBX: 00007f7a59124038 RCX: 00007f7a5901f739 RDX: 0000000000000000 RSI: 0000000000006b46 RDI: 0000000000000006 RBP: 00007f7a59079cc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7a59124038 R13: 00007ffc76deefdf R14: 00007f7a56575300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97d3e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6256: #0: ffff88802176f430 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by agetty/6494: #0: ffff88807bfdd098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc90001be52e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 4 locks held by kworker/u4:10/9295: #0: ffff8880b9c31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #0: ffff8880b9c31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #0: ffff8880b9c31ad8 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1620 [inline] #0: ffff8880b9c31ad8 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x236/0x26f0 kernel/sched/core.c:6201 #1: ffff8880b9c1f9c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39d/0x480 kernel/sched/psi.c:880 #2: ffff8880b9c20258 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:946 #3: ffffffff8b97d3e0 (rcu_read_lock){....}-{1:2}, at: spin_lock_bh include/linux/spinlock.h:368 [inline] #3: ffffffff8b97d3e0 (rcu_read_lock){....}-{1:2}, at: cfg80211_bss_update+0x88/0x2070 net/wireless/scan.c:1697 2 locks held by kworker/0:13/12934: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12934 Comm: kworker/0:13 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker RIP: 0010:strlen+0x4d/0x90 lib/string.c:566 Code: 07 38 d0 7f 04 84 c0 75 48 80 7d 00 00 74 39 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 <83> e1 07 0f b6 14 1a 38 ca 7f 04 84 d2 75 1f 80 38 00 75 de 48 83 RSP: 0018:ffffc900049e7ad8 EFLAGS: 00000a07 RAX: ffffffff898d3c46 RBX: dffffc0000000000 RCX: ffffffff898d3c46 RDX: 1ffffffff131a788 RSI: ffffffff8b97d3e0 RDI: ffffffff898d3c40 RBP: ffffffff898d3c40 R08: 0000000000000000 R09: ffffffff8d6e1397 R10: fffffbfff1adc272 R11: 0000000000000000 R12: ffffffff8b97d3e0 R13: ffffffff8b87a720 R14: ffffffff8b97d3e0 R15: ffffc900049e7ba8 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8c26489000 CR3: 000000000b68e000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: strlen include/linux/fortify-string.h:60 [inline] trace_event_get_offsets_lock include/trace/events/lock.h:39 [inline] perf_trace_lock+0xb1/0x4d0 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x4a8/0x720 kernel/locking/lockdep.c:5636 rcu_lock_release include/linux/rcupdate.h:272 [inline] rcu_read_unlock include/linux/rcupdate.h:720 [inline] gc_worker+0x4c2/0x1030 net/netfilter/nf_conntrack_core.c:1461 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 38 d0 cmp %dl,%al 2: 7f 04 jg 0x8 4: 84 c0 test %al,%al 6: 75 48 jne 0x50 8: 80 7d 00 00 cmpb $0x0,0x0(%rbp) c: 74 39 je 0x47 e: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx 15: fc ff df 18: 48 89 e8 mov %rbp,%rax 1b: 48 83 c0 01 add $0x1,%rax 1f: 48 89 c2 mov %rax,%rdx 22: 48 89 c1 mov %rax,%rcx 25: 48 c1 ea 03 shr $0x3,%rdx * 29: 83 e1 07 and $0x7,%ecx <-- trapping instruction 2c: 0f b6 14 1a movzbl (%rdx,%rbx,1),%edx 30: 38 ca cmp %cl,%dl 32: 7f 04 jg 0x38 34: 84 d2 test %dl,%dl 36: 75 1f jne 0x57 38: 80 38 00 cmpb $0x0,(%rax) 3b: 75 de jne 0x1b 3d: 48 rex.W 3e: 83 .byte 0x83