watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.0:30825] Modules linked in: irq event stamp: 3481689 hardirqs last enabled at (3481688): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (3481689): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (748216): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (748219): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (748219): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 30825 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_lockdep_rcu_enabled kernel/rcu/update.c:254 [inline] RIP: 0010:debug_lockdep_rcu_enabled kernel/rcu/update.c:251 [inline] RIP: 0010:rcu_read_lock_sched_held+0x86/0x1d0 kernel/rcu/update.c:111 Code: 83 c0 03 38 d0 7c 08 84 d2 0f 85 1c 01 00 00 8b 0d 8f 3f f5 08 85 c9 75 08 b8 01 00 00 00 5b 5d c3 65 48 8b 2c 25 c0 df 01 00 <48> 8d bd 84 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffff8880ba007d10 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000003 RBX: ffffffff8a45f160 RCX: 0000000000000001 RDX: 0000000000000004 RSI: 0000000000000002 RDI: 0000000000000001 RBP: ffff8881fb28e5c0 R08: ffffffff8cd3e130 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880ba007d58 R13: 1ffff11017400fa7 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001000 CR3: 0000000027fbe000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_timer_expire_entry include/trace/events/timer.h:90 [inline] call_timer_fn+0x65d/0x700 kernel/time/timer.c:1337 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __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:mm_update_next_owner+0x3e5/0x650 kernel/exit.c:455 Code: 4c 8d 6d 10 4c 89 e8 48 c1 e8 03 80 3c 18 00 0f 85 29 02 00 00 48 8b 45 10 48 8d a8 70 fa ff ff 49 39 c5 75 47 e9 21 ff ff ff 76 c7 29 00 4d 85 ff 0f 85 13 ff ff ff e8 68 c7 29 00 48 8d bd RSP: 0018:ffff8881c2137a98 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11007db1934 RBX: dffffc0000000000 RCX: ffffffff8138bd9e RDX: 0000000000000000 RSI: ffffffff8138be3c RDI: ffff88803ed8cc80 RBP: ffff88803ed8c580 R08: ffff88803ed8c9a0 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff888027ee5780 R13: ffff8880aa504c50 R14: ffff8881fb28e5c0 R15: ffff8880a84061c0 exit_mm kernel/exit.c:548 [inline] do_exit+0xae4/0x2be0 kernel/exit.c:857 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fc55178eae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc54ed04218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 00007fc5518a1f68 RCX: 00007fc55178eae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc5518a1f68 RBP: 00007fc5518a1f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc5518a1f6c R13: 00007ffe6e26447f R14: 00007fc54ed04300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4184 Comm: kworker/u4:8 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound call_usermodehelper_exec_work RIP: 0010:__read_once_size include/linux/compiler.h:263 [inline] RIP: 0010:queued_write_lock_slowpath+0x11f/0x290 kernel/locking/qrwlock.c:88 Code: 03 41 83 e7 07 4c 8d 2c 02 41 83 c7 03 41 0f b6 45 00 41 38 c7 7c 08 84 c0 0f 85 34 01 00 00 8b 03 3d 00 01 00 00 74 1a f3 90 <41> 0f b6 45 00 41 38 c7 7c eb 84 c0 74 e7 48 89 df e8 ab 62 4c 00 RSP: 0018:ffff8882066ff888 EFLAGS: 00000006 RAX: 0000000000000300 RBX: ffffffff89e09080 RCX: ffffffff814bfec6 RDX: 1ffffffff13c1210 RSI: 0000000000000004 RDI: ffffffff89e09080 RBP: 1ffff11040cdff12 R08: 0000000000000001 R09: fffffbfff13c1210 R10: ffffffff89e09083 R11: ffffffff8c66505b R12: ffffffff89e09084 R13: fffffbfff13c1210 R14: ffff8882066ff8b0 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd2c553c20 CR3: 00000000460f7000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: queued_write_lock include/asm-generic/qrwlock.h:103 [inline] do_raw_write_lock+0xcf/0x1e0 kernel/locking/spinlock_debug.c:203 copy_process.part.0+0x41c4/0x8260 kernel/fork.c:2000 copy_process kernel/fork.c:1710 [inline] _do_fork+0x22f/0xf30 kernel/fork.c:2219 kernel_thread+0x2f/0x40 kernel/fork.c:2278 call_usermodehelper_exec_work kernel/umh.c:199 [inline] call_usermodehelper_exec_work+0x16d/0x260 kernel/umh.c:185 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): 0: 83 c0 03 add $0x3,%eax 3: 38 d0 cmp %dl,%al 5: 7c 08 jl 0xf 7: 84 d2 test %dl,%dl 9: 0f 85 1c 01 00 00 jne 0x12b f: 8b 0d 8f 3f f5 08 mov 0x8f53f8f(%rip),%ecx # 0x8f53fa4 15: 85 c9 test %ecx,%ecx 17: 75 08 jne 0x21 19: b8 01 00 00 00 mov $0x1,%eax 1e: 5b pop %rbx 1f: 5d pop %rbp 20: c3 retq 21: 65 48 8b 2c 25 c0 df mov %gs:0x1dfc0,%rbp 28: 01 00 * 2a: 48 8d bd 84 08 00 00 lea 0x884(%rbp),%rdi <-- trapping instruction 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 48 89 fa mov %rdi,%rdx 3e: 48 rex.W 3f: c1 .byte 0xc1