watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.3:9613] Modules linked in: irq event stamp: 3837005 hardirqs last enabled at (3837004): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (3837005): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (1016): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (1485): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (1485): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9613 Comm: syz-executor.3 Not tainted 4.14.267-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b4332100 task.stack: ffff888071168000 RIP: 0010:jhash2 include/linux/jhash.h:138 [inline] RIP: 0010:hash_stack lib/stackdepot.c:165 [inline] RIP: 0010:depot_save_stack+0x207/0x3f0 lib/stackdepot.c:221 RSP: 0018:ffff8880ba4072c0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000016e8b20f RBX: 0000000000f0722b RCX: 0000000000000002 RDX: 000000004f752698 RSI: 00000000ba934c27 RDI: 000000005072a71f RBP: ffff8880ba407318 R08: 0000000000000000 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8880b4332100 R12: 0000000001089220 R13: 0000000000000013 R14: ffff8880ba407330 R15: 0000000000000028 FS: 00007f8d9a3f0700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ed25000 CR3: 00000000a5328000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: save_stack mm/kasan/kasan.c:453 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0x139/0x160 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 kmem_cache_zalloc include/linux/slab.h:651 [inline] fill_pool lib/debugobjects.c:110 [inline] __debug_object_init+0x578/0x7a0 lib/debugobjects.c:341 debug_object_init lib/debugobjects.c:393 [inline] debug_object_activate+0x391/0x490 lib/debugobjects.c:474 debug_rcu_head_queue kernel/rcu/rcu.h:152 [inline] __call_rcu.constprop.0+0x31/0x7d0 kernel/rcu/tree.c:3050 neigh_destroy+0x343/0x460 net/core/neighbour.c:762 neigh_release include/net/neighbour.h:416 [inline] neigh_cleanup_and_release+0x9e/0xc0 net/core/neighbour.c:108 neigh_del+0x161/0x1f0 net/core/neighbour.c:141 neigh_forced_gc net/core/neighbour.c:190 [inline] neigh_alloc net/core/neighbour.c:315 [inline] __neigh_create+0xc5d/0x19b0 net/core/neighbour.c:499 ip6_finish_output2+0x802/0x1f10 net/ipv6/ip6_output.c:117 ip6_finish_output+0x5c6/0xd50 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0x82a/0x1390 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x2bb/0x5a0 net/ipv6/addrconf.c:3769 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:mutex_remove_waiter+0x0/0x440 kernel/locking/mutex-debug.c:63 RSP: 0018:ffff88807116f860 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffff8880b4332100 RCX: 000000000000164f RDX: ffff8880b4332100 RSI: ffff88807116f938 RDI: ffffffff89472ac0 RBP: ffff8880b4332105 R08: ffffffff8b9add38 R09: 0000000000040570 R10: ffff8880b43329b0 R11: ffff8880b4332100 R12: ffff8880b4332100 R13: ffff88807116f938 R14: ffffffff89472ac0 R15: ffffffff89472ac8 __mutex_lock_common kernel/locking/mutex.c:861 [inline] __mutex_lock+0x319/0x1310 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1937 [inline] tty_open+0x31f/0x8b0 drivers/tty/tty_io.c:2021 chrdev_open+0x23c/0x6d0 fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f8d9ba2df74 RSP: 002b:00007f8d9a3efca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8d9bb8df60 RCX: 00007f8d9ba2df74 RDX: 0000000000000002 RSI: 00007f8d9a3efd40 RDI: 00000000ffffff9c RBP: 00007f8d9a3efd40 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007ffd18ca988f R14: 00007f8d9a3f0300 R15: 0000000000022000 Code: 85 3a ff ff ff e9 3f ff ff ff 03 5a 08 03 42 04 03 32 89 c2 31 c3 c1 c2 0e 29 d3 89 da 31 de c1 c2 0b 29 d6 89 f2 31 f0 c1 ca 07 <29> d0 89 c2 31 c3 c1 c2 10 29 d3 89 da 31 de c1 c2 04 29 d6 31 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9554 Comm: syz-executor.2 Not tainted 4.14.267-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b4c8e040 task.stack: ffff888072708000 RIP: 0010:hrtimer_get_expires include/linux/hrtimer.h:237 [inline] RIP: 0010:hrtimer_forward+0x35/0x1e0 kernel/time/hrtimer.c:803 RSP: 0018:ffff8880ba507bb0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff888096d74ec8 RCX: 0000000000000017 RDX: 1ffff11012dae9dc RSI: 00000023a4a63a7b RDI: ffff888096d74ee0 RBP: 000000000000317c R08: ffff88823fff7058 R09: ffff88823fff704f R10: ffff88823fff7057 R11: 00000024fb8cd656 R12: 00000023a4a63a7b R13: 0000000000000001 R14: 000000000000317c R15: ffff8880ba52ed40 FS: 00007f4ebc557700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ed23000 CR3: 000000009cb1f000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_forward_now include/linux/hrtimer.h:457 [inline] perf_swevent_hrtimer+0x2c3/0x350 kernel/events/core.c:8759 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x30b/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:99 [inline] RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:412 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x26e/0x910 kernel/locking/qspinlock.c:465 RSP: 0018:ffff88807270f908 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffff8880ba534f00 RCX: fffffbfff128e559 RDX: 0000000000001870 RSI: 0000000000000000 RDI: 0000000000000286 RBP: ffffffff89472ac8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff89472ac9 R15: ffffed10174a69e8 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:669 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:52 [inline] queued_spin_lock include/asm-generic/qspinlock.h:90 [inline] do_raw_spin_lock+0x178/0x200 kernel/locking/spinlock_debug.c:113 spin_lock include/linux/spinlock.h:317 [inline] __mutex_lock_common kernel/locking/mutex.c:768 [inline] __mutex_lock+0x3f3/0x1310 kernel/locking/mutex.c:893 t_start+0x17/0x50 fs/proc/proc_tty.c:108 seq_read+0x2cd/0x1180 fs/seq_file.c:235 proc_reg_read+0xee/0x1a0 fs/proc/inode.c:217 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_preadv fs/read_write.c:1065 [inline] SYSC_preadv fs/read_write.c:1115 [inline] SyS_preadv+0x15a/0x200 fs/read_write.c:1110 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f4ebdbe2059 RSP: 002b:00007f4ebc557168 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f4ebdcf4f60 RCX: 00007f4ebdbe2059 RDX: 0000000000000332 RSI: 00000000200017c0 RDI: 0000000000000006 RBP: 00007f4ebdc3c08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcb099d4df R14: 00007f4ebc557300 R15: 0000000000022000 Code: f4 55 48 89 d5 53 48 89 fb 48 83 ec 18 e8 14 88 0c 00 48 8d 7b 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 90 01 00 00 4c 8b 6b 18 4c 89 e0 45 31 f6 4c 29 e8 48 89 ---------------- Code disassembly (best guess), 5 bytes skipped: 0: e9 3f ff ff ff jmpq 0xffffff44 5: 03 5a 08 add 0x8(%rdx),%ebx 8: 03 42 04 add 0x4(%rdx),%eax b: 03 32 add (%rdx),%esi d: 89 c2 mov %eax,%edx f: 31 c3 xor %eax,%ebx 11: c1 c2 0e rol $0xe,%edx 14: 29 d3 sub %edx,%ebx 16: 89 da mov %ebx,%edx 18: 31 de xor %ebx,%esi 1a: c1 c2 0b rol $0xb,%edx 1d: 29 d6 sub %edx,%esi 1f: 89 f2 mov %esi,%edx 21: 31 f0 xor %esi,%eax 23: c1 ca 07 ror $0x7,%edx * 26: 29 d0 sub %edx,%eax <-- trapping instruction 28: 89 c2 mov %eax,%edx 2a: 31 c3 xor %eax,%ebx 2c: c1 c2 10 rol $0x10,%edx 2f: 29 d3 sub %edx,%ebx 31: 89 da mov %ebx,%edx 33: 31 de xor %ebx,%esi 35: c1 c2 04 rol $0x4,%edx 38: 29 d6 sub %edx,%esi 3a: 31 .byte 0x31