sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 print_req_error: 3 callbacks suppressed blk_update_request: I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0 watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.4:7244] Modules linked in: irq event stamp: 5678986 hardirqs last enabled at (5678985): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (5678986): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1094 softirqs last enabled at (1498126): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (1497793): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 7244 Comm: syz-executor.4 Not tainted 5.10.226 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:19 [inline] RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:100 [inline] RIP: 0010:queued_spin_lock_slowpath+0x122/0x8c0 kernel/locking/qspinlock.c:326 Code: 00 00 00 65 48 2b 04 25 28 00 00 00 0f 85 09 07 00 00 48 81 c4 88 00 00 00 5b 5d 41 5c 41 5d 41 5e 41 5f e9 00 a4 f8 02 f3 90 73 ff ff ff 44 8b 74 24 48 41 81 fe 00 01 00 00 0f 84 e1 00 00 RSP: 0018:ffff88804e07f2b8 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffffff850dad20 RCX: ffffffff81279b47 RDX: fffffbfff0a1b5a5 RSI: 0000000000000004 RDI: ffffffff850dad20 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff850dad23 R10: fffffbfff0a1b5a4 R11: 0000000000000001 R12: 0000000000000003 R13: fffffbfff0a1b5a4 R14: 0000000000000001 R15: 1ffff11009c0fe58 FS: 00007f9e1c3f4700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005652b171c678 CR3: 000000004bcd8000 CR4: 0000000000350ef0 Call Trace: queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock+0x1dc/0x260 kernel/locking/spinlock_debug.c:113 spin_lock include/linux/spinlock.h:354 [inline] __register_sysctl_table+0x637/0x1090 fs/proc/proc_sysctl.c:1329 neigh_sysctl_register+0x34a/0x6b0 net/core/neighbour.c:3713 devinet_sysctl_register+0xb1/0x230 net/ipv4/devinet.c:2622 inetdev_init+0x234/0x500 net/ipv4/devinet.c:276 inetdev_event+0xde6/0x1610 net/ipv4/devinet.c:1531 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xb3/0x110 kernel/notifier.c:410 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2047 call_netdevice_notifiers_extack net/core/dev.c:2059 [inline] call_netdevice_notifiers net/core/dev.c:2073 [inline] register_netdevice+0x1063/0x1480 net/core/dev.c:10060 register_netdev+0x2d/0x50 net/core/dev.c:10153 loopback_net_init+0x76/0x170 drivers/net/loopback.c:216 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 copy_namespaces+0x3fb/0x4f0 kernel/nsproxy.c:179 copy_process+0x385b/0x7800 kernel/fork.c:2129 kernel_clone+0xe7/0x980 kernel/fork.c:2506 __do_sys_clone3+0x1e5/0x320 kernel/fork.c:2781 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 RIP: 0033:0x7f9e1ee7eb19 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:00007f9e1c3f4188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f9e1ef91f60 RCX: 00007f9e1ee7eb19 RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020000200 RBP: 00007f9e1eed8f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc35c2c7f R14: 00007f9e1c3f4300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6386 Comm: kworker/1:3 Not tainted 5.10.226 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Workqueue: 0x0 (events) RIP: 0010:__lock_acquire+0xd71/0x5b00 kernel/locking/lockdep.c:4825 Code: 01 00 00 00 0f 86 c0 00 00 00 89 05 89 eb 18 05 e9 b5 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 <0f> 85 75 2f 00 00 49 81 3e 00 22 15 86 0f 84 5f f3 ff ff 83 fe 01 RSP: 0018:ffff88804bcc7bf0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 1ffff11009798fac RCX: 0000000000000000 RDX: 1ffff1100d9e755b RSI: 0000000000000000 RDI: ffff88806cf3aad8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000046 R11: 0000000000000001 R12: ffff888046c69a40 R13: 0000000000000001 R14: ffff88806cf3aad8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f88fc0e84a8 CR3: 000000004b4d0000 CR4: 0000000000350ee0 Call Trace: lock_acquire kernel/locking/lockdep.c:5566 [inline] lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0x2f/0x40 kernel/locking/spinlock.c:167 worker_thread+0x15c/0x1310 kernel/workqueue.c:2378 kthread+0x38f/0x470 kernel/kthread.c:328 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 65 48 add %ah,0x48(%rbp) 5: 2b 04 25 28 00 00 00 sub 0x28,%eax c: 0f 85 09 07 00 00 jne 0x71b 12: 48 81 c4 88 00 00 00 add $0x88,%rsp 19: 5b pop %rbx 1a: 5d pop %rbp 1b: 41 5c pop %r12 1d: 41 5d pop %r13 1f: 41 5e pop %r14 21: 41 5f pop %r15 23: e9 00 a4 f8 02 jmpq 0x2f8a428 28: f3 90 pause * 2a: e9 73 ff ff ff jmpq 0xffffffa2 <-- trapping instruction 2f: 44 8b 74 24 48 mov 0x48(%rsp),%r14d 34: 41 81 fe 00 01 00 00 cmp $0x100,%r14d 3b: 0f .byte 0xf 3c: 84 e1 test %ah,%cl