INFO: task syz-executor.2:8730 blocked for more than 143 seconds. Not tainted 5.18.0-rc6-syzkaller-00153-g2fe1020d73ca #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27872 pid: 8730 ppid: 3631 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0xa9a/0x4cc0 kernel/sched/core.c:6388 schedule+0xd2/0x1f0 kernel/sched/core.c:6460 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1860 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x373/0x530 kernel/sched/completion.c:106 io_wq_exit_workers fs/io-wq.c:1266 [inline] io_wq_put_and_exit+0x4d6/0xe40 fs/io-wq.c:1301 io_uring_clean_tctx fs/io_uring.c:10391 [inline] io_uring_cancel_generic+0x538/0x5bc fs/io_uring.c:10461 io_uring_files_cancel include/linux/io_uring.h:18 [inline] do_exit+0x4f9/0x2a00 kernel/exit.c:750 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 get_signal+0x22df/0x24c0 kernel/signal.c:2864 arch_do_signal_or_restart+0x82/0x20f0 arch/x86/kernel/signal.c:867 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe60a0890e9 RSP: 002b:00007fe60b1e4218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fe60a19bf68 RCX: 00007fe60a0890e9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe60a19bf68 RBP: 00007fe60a19bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe60a19bf6c R13: 00007ffcd909d02f R14: 00007fe60b1e4300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bd7f5e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6467 1 lock held by klogd/2955: 2 locks held by getty/3277: #0: ffff88814c575098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90001bf92e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcea/0x1230 drivers/tty/n_tty.c:2075 1 lock held by iou-wrk-8730/8741: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.18.0-rc6-syzkaller-00153-g2fe1020d73ca #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:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:369 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 50 Comm: kworker/u4:2 Not tainted 5.18.0-rc6-syzkaller-00153-g2fe1020d73ca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_preemption_disabled+0x43/0x170 lib/smp_processor_id.c:56 Code: 94 76 65 8b 1d 7e 35 95 76 81 e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00 85 db 74 11 0f 1f 44 00 00 44 89 e0 5b 5d 41 5c 41 5d <41> 5e c3 0f 1f 44 00 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de 0f RSP: 0018:ffffc90000dbfb88 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff815cdbf1 RDX: fffffbfff1b71c8b RSI: 0000000000000002 RDI: 0000000000000000 RBP: 1ffff920001b7f7a R08: 0000000000000000 R09: ffffffff8db8e457 R10: fffffbfff1b71c8a R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: dffffc0000000000 R15: 000000000000028f FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f857ceb9000 CR3: 00000000264f6000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:341 [inline] rcu_is_watching+0xe/0xb0 kernel/rcu/tree.c:1138 rcu_read_lock_held_common kernel/rcu/update.c:108 [inline] rcu_read_lock_sched_held+0x1c/0x70 kernel/rcu/update.c:123 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x522/0x720 kernel/locking/lockdep.c:5652 rcu_lock_release include/linux/rcupdate.h:273 [inline] rcu_read_unlock include/linux/rcupdate.h:727 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] batadv_nc_worker+0x86b/0xfa0 net/batman-adv/network-coding.c:719 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 ---------------- Code disassembly (best guess): 0: 94 xchg %eax,%esp 1: 76 65 jbe 0x68 3: 8b 1d 7e 35 95 76 mov 0x7695357e(%rip),%ebx # 0x76953587 9: 81 e3 ff ff ff 7f and $0x7fffffff,%ebx f: 31 ff xor %edi,%edi 11: 89 de mov %ebx,%esi 13: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 18: 85 db test %ebx,%ebx 1a: 74 11 je 0x2d 1c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 21: 44 89 e0 mov %r12d,%eax 24: 5b pop %rbx 25: 5d pop %rbp 26: 41 5c pop %r12 28: 41 5d pop %r13 * 2a: 41 5e pop %r14 <-- trapping instruction 2c: c3 retq 2d: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 32: 9c pushfq 33: 5b pop %rbx 34: 81 e3 00 02 00 00 and $0x200,%ebx 3a: 31 ff xor %edi,%edi 3c: 48 89 de mov %rbx,%rsi 3f: 0f .byte 0xf