watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.2:15816] Modules linked in: irq event stamp: 2933669 hardirqs last enabled at (2933668): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (2933668): [] _raw_spin_unlock_irq+0x24/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (2933669): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (1814508): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (1814511): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (1814511): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 15816 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:192 Code: c0 98 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 01 31 d8 01 00 74 25 fb 66 0f 1f 44 00 00 01 00 00 00 e8 26 1b 28 f9 65 8b 05 9f 8d e8 77 85 c0 74 02 5d RSP: 0018:ffff8880ba107de0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3053 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888034f3eac4 RBP: ffff8880ba122b40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8688f6d0 R13: ffff8880ba122b40 R14: ffff8880ba107e78 R15: 0000000000000000 FS: 00007f06b4413700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f06b4412d38 CR3: 000000004a32b000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: expire_timers+0x238/0x4e0 kernel/time/timer.c:1374 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:check_preemption_disabled+0x45/0x280 lib/smp_processor_id.c:52 Code: 8a 7c 65 8b 1d 3c c1 8a 7c 81 e3 ff ff ff 7f 31 ff 89 de e8 bd 68 eb fd 85 db 74 18 e8 44 67 eb fd e8 3f 67 eb fd 44 89 e0 5b <5d> 41 5c 41 5d 41 5e 41 5f c3 e8 2c 67 eb fd 48 c7 c0 80 82 f1 89 RSP: 0018:ffff888015e5f938 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffc900063ae000 RDX: 0000000000003308 RSI: ffffffff83771e31 RDI: 0000000000000005 RBP: ffffffff88b3e120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff88b3e0e0 R14: dffffc0000000000 R15: 000000000002b0c0 __schedule+0x7b/0x2040 kernel/sched/core.c:3435 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3744 retint_kernel+0x1b/0x2d RIP: 0010:drop_links fs/namei.c:585 [inline] RIP: 0010:terminate_walk+0x34/0x5c0 fs/namei.c:595 Code: 89 fd 53 48 83 ec 20 e8 1a f9 bc ff 48 8d 45 48 48 89 c2 48 89 44 24 10 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e 86 04 00 00 44 8b 65 48 31 ff 41 8d 5c 24 RSP: 0018:ffff888015e5fb18 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900063ae000 RDX: 1ffff11002bcbfa5 RSI: ffffffff81a58c56 RDI: ffff888015e5fce0 RBP: ffff888015e5fce0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888015e5fce0 R14: ffff88809cab333c R15: ffff888015e5fe90 path_openat+0x140a/0x2df0 fs/namei.c:3541 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f06b5a50f74 Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44 RSP: 002b:00007f06b4412ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f06b5bb0f60 RCX: 00007f06b5a50f74 RDX: 0000000000000002 RSI: 00007f06b4412d40 RDI: 00000000ffffff9c RBP: 00007f06b4412d40 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007ffc926c613f R14: 00007f06b4413300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 22410 Comm: kworker/u4:0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] RIP: 0010:read_seqcount_begin include/linux/seqlock.h:164 [inline] RIP: 0010:ktime_get_update_offsets_now+0x129/0x460 kernel/time/timekeeping.c:2225 Code: 88 82 f1 89 48 c1 e8 03 80 3c 18 00 0f 85 be 02 00 00 48 83 3d 0f ac 9c 08 00 0f 84 66 02 00 00 e8 ec ae 0d 00 4c 89 e7 57 9d <0f> 1f 44 00 00 e8 cd d6 12 00 e8 d8 ae 0d 00 44 8b 3d e1 7d a4 08 RSP: 0018:ffff8880ba007eb0 EFLAGS: 00000006 RAX: ffff88802bba4680 RBX: dffffc0000000000 RCX: ffffffff8154d64d RDX: 0000000000010000 RSI: ffffffff8154d684 RDI: 0000000000000006 RBP: fffffbfff13e3050 R08: ffffffff8cd33fc8 R09: 0000000000000000 R10: 0000000000000007 R11: ffffffff8c66501b R12: 0000000000000006 R13: ffff8880ba024d00 R14: ffff8880ba024cc0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c01f581000 CR3: 00000000a1175000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_update_base kernel/time/hrtimer.c:621 [inline] hrtimer_interrupt+0x138/0x9e0 kernel/time/hrtimer.c:1567 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_acquire+0x1ec/0x3c0 kernel/locking/lockdep.c:3911 Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 b7 01 00 00 48 83 3d 09 2e a6 08 00 0f 84 2a 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff88802c0a7be8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: ffff88802bba4680 RCX: 4c7f46d5f39d3529 RDX: dffffc0000000000 RSI: 00000000cf510ad1 RDI: 0000000000000286 RBP: ffffffff89f85fa0 R08: 00000000ab6a5069 R09: 0000000000000002 R10: ffff88802bba4f58 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] batadv_nc_process_nc_paths.part.0+0xec/0x3d0 net/batman-adv/network-coding.c:698 batadv_nc_process_nc_paths net/batman-adv/network-coding.c:690 [inline] batadv_nc_worker+0xa59/0xd50 net/batman-adv/network-coding.c:746 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 ---------------- Code disassembly (best guess), 5 bytes skipped: 0: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 7: fc ff df a: 48 c1 e8 03 shr $0x3,%rax e: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 12: 75 31 jne 0x45 14: 48 83 3d 01 31 d8 01 cmpq $0x0,0x1d83101(%rip) # 0x1d8311d 1b: 00 1c: 74 25 je 0x43 1e: fb sti 1f: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) * 25: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction 2a: e8 26 1b 28 f9 callq 0xf9281b55 2f: 65 8b 05 9f 8d e8 77 mov %gs:0x77e88d9f(%rip),%eax # 0x77e88dd5 36: 85 c0 test %eax,%eax 38: 74 02 je 0x3c 3a: 5d pop %rbp