VFS: could not find a valid V7 on loop0. watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.3:20986] Modules linked in: irq event stamp: 2828655 hardirqs last enabled at (2828654): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (2828655): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (0): [] copy_process.part.0+0x15b9/0x8260 kernel/fork.c:1856 softirqs last disabled at (631): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (631): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 20986 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__orc_find+0x50/0xf0 arch/x86/kernel/unwind_orc.c:46 Code: 00 00 00 49 bf 00 00 00 00 00 fc ff df 49 89 fe 48 89 fd eb 0c 48 8d 6b 04 49 89 de 49 39 ec 72 4d 4c 89 e0 48 29 e8 48 89 c2 <48> c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 RSP: 0018:ffff8880ba007598 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 1ffff11017400ec5 RCX: ffffffff81007718 RDX: 0000000000000000 RSI: ffffffff8b8cd904 RDI: ffffffff8b30530c RBP: ffffffff8b30530c R08: 0000000000000000 R09: ffffffff8b8cd904 R10: ffff8880ba00776f R11: 0000000000074071 R12: ffffffff8b30530c R13: ffffffff8b30530c R14: ffffffff8b30530c R15: dffffc0000000000 FS: 00007fb838e78700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb83a616028 CR3: 000000004c693000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:159 [inline] unwind_next_frame+0x339/0x1400 arch/x86/kernel/unwind_orc.c:422 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 kmem_cache_alloc_node_trace+0x151/0x3b0 mm/slab.c:3668 __do_kmalloc_node mm/slab.c:3688 [inline] __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3703 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0xae/0x560 net/core/skbuff.c:205 __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_ip4_multicast_alloc_query net/bridge/br_multicast.c:383 [inline] br_multicast_alloc_query net/bridge/br_multicast.c:582 [inline] __br_multicast_send_query+0x1146/0x2dc0 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_ip4_multicast_query_expired+0xdc/0x110 net/bridge/br_multicast.c:1950 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:preempt_schedule_irq+0xa6/0x140 kernel/sched/core.c:3744 Code: 00 00 e8 3d 04 29 f9 e8 58 3f 4f f9 4c 89 e8 48 c1 e8 03 80 3c 18 00 75 69 48 83 3d 9b 18 d9 01 00 74 5b fb 66 0f 1f 44 00 00 01 00 00 00 e8 40 d1 ff ff 48 c7 c0 90 82 f1 89 48 c1 e8 03 80 RSP: 0018:ffff88809eda7ad0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3053 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880b4e8e944 RBP: ffffed10169d1c18 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b4e8e0c0 R13: ffffffff89f18298 R14: 0000000000000000 R15: 0000000000000000 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:slab_alloc mm/slab.c:3390 [inline] RIP: 0010:kmem_cache_alloc+0x2c4/0x370 mm/slab.c:3557 Code: 00 48 c7 c7 03 6c b8 89 e8 e9 5e a9 ff e9 b5 fd ff ff e8 ef 92 cf ff 48 83 3d 2f 6c 59 08 00 0f 84 ae 00 00 00 4c 89 ff 57 9d <0f> 1f 44 00 00 e9 1c fe ff ff 65 ff 05 db c8 69 7e 48 8b 05 cc e5 RSP: 0018:ffff88809eda7ba0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 00000000006080c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: 00000000006080c0 R08: ffffffff8cd233c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88804e45d280 R13: ffff88823b833940 R14: ffff88823b833940 R15: 0000000000000286 kmem_cache_zalloc include/linux/slab.h:699 [inline] copy_signal kernel/fork.c:1489 [inline] copy_process.part.0+0x2146/0x8260 kernel/fork.c:1910 copy_process kernel/fork.c:1710 [inline] _do_fork+0x22f/0xf30 kernel/fork.c:2219 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb83a502e99 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:00007fb838e78168 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fb83a615f60 RCX: 00007fb83a502e99 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000080100900 RBP: 00007fb83a55cff1 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdf06f996f R14: 00007fb838e78300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 00 00 add %al,(%rax) 2: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 9: fc ff df c: 49 89 fe mov %rdi,%r14 f: 48 89 fd mov %rdi,%rbp 12: eb 0c jmp 0x20 14: 48 8d 6b 04 lea 0x4(%rbx),%rbp 18: 49 89 de mov %rbx,%r14 1b: 49 39 ec cmp %rbp,%r12 1e: 72 4d jb 0x6d 20: 4c 89 e0 mov %r12,%rax 23: 48 29 e8 sub %rbp,%rax 26: 48 89 c2 mov %rax,%rdx * 29: 48 c1 e8 3f shr $0x3f,%rax <-- trapping instruction 2d: 48 c1 fa 02 sar $0x2,%rdx 31: 48 01 d0 add %rdx,%rax 34: 48 d1 f8 sar %rax 37: 48 8d 5c 85 00 lea 0x0(%rbp,%rax,4),%rbx 3c: 48 89 d8 mov %rbx,%rax