watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.5:12238] Modules linked in: irq event stamp: 2048515 hardirqs last enabled at (2048514): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (2048515): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (289496): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (289799): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (289799): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 12238 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ksize+0x45/0x60 mm/slab.c:4487 Code: 00 00 00 00 00 ea ff ff 48 c1 e8 0c 48 c1 e0 06 48 01 d0 48 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 48 8b 40 18 4c 63 60 74 <4c> 89 e6 e8 13 65 00 00 4c 89 e0 5d 41 5c c3 0f 0b 45 31 e4 eb f2 RSP: 0018:ffff8880ba107a50 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff88813bff0940 RBX: ffff8880173bad40 RCX: ffffea00005cee07 RDX: 0000000000000000 RSI: ffffffff812b5eca RDI: ffff8880173bad40 RBP: ffff8880173bad40 R08: 0000000000492220 R09: 0000000000000000 R10: 0000000000000007 R11: 000000004f994b9c R12: 0000000000000200 R13: 00000000ffffffff R14: 0000000000000000 R15: ffff8880173b9980 FS: 00007fbc73f5e700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555571cd848 CR3: 000000002c80e000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __alloc_skb+0xc7/0x560 net/core/skbuff.c:212 __netdev_alloc_skb+0x76/0x460 net/core/skbuff.c:407 __netdev_alloc_skb_ip_align include/linux/skbuff.h:2700 [inline] netdev_alloc_skb_ip_align include/linux/skbuff.h:2710 [inline] br_ip6_multicast_alloc_query net/bridge/br_multicast.c:479 [inline] br_multicast_alloc_query net/bridge/br_multicast.c:585 [inline] __br_multicast_send_query+0x1a7/0x2dc0 net/bridge/br_multicast.c:941 br_multicast_send_query+0x216/0x3a0 net/bridge/br_multicast.c:988 br_multicast_query_expired net/bridge/br_multicast.c:1942 [inline] br_ip6_multicast_query_expired+0xdc/0x110 net/bridge/br_multicast.c:1958 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 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: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:ffff8880afb378f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: ffff8880227de500 RCX: 6ef1e41ac93df87f RDX: dffffc0000000000 RSI: 000000009004fc4c RDI: 0000000000000286 RBP: ffffffff89f85fa0 R08: 00000000594ea6fa R09: 0000000000000000 R10: ffff8880227ded88 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] dput+0x70/0x640 fs/dcache.c:832 path_to_nameidata fs/namei.c:838 [inline] step_into fs/namei.c:1777 [inline] walk_component+0x4dc/0xda0 fs/namei.c:1830 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142 link_path_walk fs/namei.c:2073 [inline] path_openat+0x1db/0x2df0 fs/namei.c:3536 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: 0033:0x7fbc755e8e99 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:00007fbc73f5e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fbc756fbf60 RCX: 00007fbc755e8e99 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 00007fbc75642ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc998bb7bf R14: 00007fbc73f5e300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 ea add %ch,%dl 6: ff (bad) 7: ff 48 c1 decl -0x3f(%rax) a: e8 0c 48 c1 e0 callq 0xe0c1481b f: 06 (bad) 10: 48 01 d0 add %rdx,%rax 13: 48 8b 50 08 mov 0x8(%rax),%rdx 17: 48 8d 4a ff lea -0x1(%rdx),%rcx 1b: 83 e2 01 and $0x1,%edx 1e: 48 0f 45 c1 cmovne %rcx,%rax 22: 48 8b 40 18 mov 0x18(%rax),%rax 26: 4c 63 60 74 movslq 0x74(%rax),%r12 * 2a: 4c 89 e6 mov %r12,%rsi <-- trapping instruction 2d: e8 13 65 00 00 callq 0x6545 32: 4c 89 e0 mov %r12,%rax 35: 5d pop %rbp 36: 41 5c pop %r12 38: c3 retq 39: 0f 0b ud2 3b: 45 31 e4 xor %r12d,%r12d 3e: eb f2 jmp 0x32