EXT4-fs (loop2): VFS: Can't find ext4 filesystem watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.7:4161] Modules linked in: irq event stamp: 6338879 hardirqs last enabled at (6338878): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (6338879): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1106 softirqs last enabled at (6313628): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (6313635): [] asm_call_irq_on_stack+0x12/0x20 CPU: 1 PID: 4161 Comm: syz-executor.7 Not tainted 5.10.230 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__ptr_ring_empty include/linux/ptr_ring.h:196 [inline] RIP: 0010:__skb_array_empty include/linux/skb_array.h:68 [inline] RIP: 0010:pfifo_fast_dequeue+0x87/0xbb0 net/sched/sch_generic.c:675 Code: 16 fe 49 8d 84 24 00 ff ff ff 48 89 04 24 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 36 09 00 00 45 8b 3c 24 <31> ff 44 8d 75 01 44 89 fe e8 ab 56 16 fe 45 85 ff 0f 84 11 05 00 RSP: 0018:ffff88806cf096d8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88804796b000 RCX: ffffffff832a9f05 RDX: ffff888045e61a40 RSI: ffffffff832a60ef RDI: ffff88804796b000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8686a77f R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804796b3c0 R13: dffffc0000000000 R14: dffffc0000000000 R15: 00000000000003e8 FS: 00007f454c9a8700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564a5aad8f78 CR3: 00000000472f4000 CR4: 0000000000350ee0 Call Trace: dequeue_skb net/sched/sch_generic.c:286 [inline] qdisc_restart net/sched/sch_generic.c:391 [inline] __qdisc_run+0x1b3/0x1570 net/sched/sch_generic.c:409 qdisc_run include/net/pkt_sched.h:127 [inline] qdisc_run include/net/pkt_sched.h:124 [inline] __dev_xmit_skb net/core/dev.c:3811 [inline] __dev_queue_xmit+0xd43/0x2690 net/core/dev.c:4167 neigh_hh_output include/net/neighbour.h:493 [inline] neigh_output include/net/neighbour.h:507 [inline] ip6_finish_output2+0x17b4/0x1fe0 net/ipv6/ip6_output.c:145 __ip6_finish_output.part.0+0x4f7/0xbc0 net/ipv6/ip6_output.c:216 __ip6_finish_output include/linux/skbuff.h:969 [inline] ip6_finish_output net/ipv6/ip6_output.c:226 [inline] NF_HOOK_COND include/linux/netfilter.h:285 [inline] ip6_output+0x3b8/0x7e0 net/ipv6/ip6_output.c:249 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ndisc_send_skb+0xa82/0x1860 net/ipv6/ndisc.c:511 ndisc_send_rs+0x131/0x560 net/ipv6/ndisc.c:705 addrconf_rs_timer+0x2ec/0x790 net/ipv6/addrconf.c:3935 call_timer_fn+0x182/0x4a0 kernel/time/timer.c:1444 expire_timers kernel/time/timer.c:1489 [inline] __run_timers.part.0+0x667/0x9a0 kernel/time/timer.c:1783 __run_timers kernel/time/timer.c:1761 [inline] run_timer_softirq+0x80/0x120 kernel/time/timer.c:1796 __do_softirq+0x1b8/0x7c9 kernel/softirq.c:298 asm_call_irq_on_stack+0x12/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x80/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x114/0x1b0 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x43/0xa0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:767 [inline] RIP: 0010:mod_objcg_state mm/slab.h:314 [inline] RIP: 0010:memcg_slab_free_hook mm/slab.h:383 [inline] RIP: 0010:memcg_slab_free_hook mm/slab.h:351 [inline] RIP: 0010:do_slab_free mm/slub.c:3105 [inline] RIP: 0010:___cache_free+0x1aa/0x360 mm/slub.c:3156 Code: af 80 00 00 00 0f 85 c3 00 00 00 9c 41 5d fa 41 f7 c5 00 02 00 00 0f 85 5d 01 00 00 44 89 fa 44 89 f6 e8 09 11 02 00 41 55 9d 21 c3 79 02 85 c0 0f 85 f7 00 00 00 65 ff 0d 92 ef 95 7e e8 1d RSP: 0018:ffff88801838fa08 EFLAGS: 00000246 RAX: 00000000006056a1 RBX: ffff888015739be8 RCX: 1ffffffff0d0e152 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff816c8108 RBP: ffff88800e19c400 R08: 0000000000000001 R09: ffffffff8686a6ef R10: fffffbfff0d0d4dd R11: 0000000000000001 R12: ffff8880083f9000 R13: 0000000000000246 R14: 0000000000000005 R15: 00000000fffffe80 qlink_free mm/kasan/quarantine.c:151 [inline] qlist_free_all+0x59/0xe0 mm/kasan/quarantine.c:170 quarantine_reduce+0x184/0x210 mm/kasan/quarantine.c:267 __kasan_kmalloc.constprop.0+0xa2/0xd0 mm/kasan/common.c:442 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:664 [inline] __netlink_kernel_create+0x1a9/0x860 net/netlink/af_netlink.c:2052 netlink_kernel_create include/linux/netlink.h:60 [inline] uevent_net_init+0xf7/0x300 lib/kobject_uevent.c:785 ops_init+0xbb/0x6b0 net/core/net_namespace.c:156 setup_net+0x2d8/0x810 net/core/net_namespace.c:354 copy_net_ns+0x2c0/0x5d0 net/core/net_namespace.c:495 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231 ksys_unshare+0x449/0x8a0 kernel/fork.c:3003 __do_sys_unshare kernel/fork.c:3071 [inline] __se_sys_unshare kernel/fork.c:3069 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3069 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 RIP: 0033:0x7f454f432b19 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:00007f454c9a8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f454f545f60 RCX: 00007f454f432b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000004a060400 RBP: 00007f454f48cf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff581a2e6f R14: 00007f454c9a8300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0xe/0x20 arch/x86/kernel/process.c:706 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 49 8d 84 24 00 ff ff lea -0x100(%r12),%rax 7: ff 8: 48 89 04 24 mov %rax,(%rsp) c: 4c 89 e0 mov %r12,%rax f: 48 c1 e8 03 shr $0x3,%rax 13: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax 18: 84 c0 test %al,%al 1a: 74 08 je 0x24 1c: 3c 03 cmp $0x3,%al 1e: 0f 8e 36 09 00 00 jle 0x95a 24: 45 8b 3c 24 mov (%r12),%r15d * 28: 31 ff xor %edi,%edi <-- trapping instruction 2a: 44 8d 75 01 lea 0x1(%rbp),%r14d 2e: 44 89 fe mov %r15d,%esi 31: e8 ab 56 16 fe callq 0xfe1656e1 36: 45 85 ff test %r15d,%r15d 39: 0f .byte 0xf 3a: 84 11 test %dl,(%rcx) 3c: 05 .byte 0x5