audit: type=1804 audit(1586695155.593:437): pid=26343 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir624020947/syzkaller.vzs3tH/1/bus" dev="sda1" ino=15761 res=1 INFO: task syz-executor.0:26344 blocked for more than 140 seconds. Not tainted 4.14.175-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29424 26344 26048 0x00000004 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893 sock_ioctl+0x239/0x450 net/socket.c:1036 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c889 RSP: 002b:00007ff6e6466c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff6e64676d4 RCX: 000000000045c889 RDX: 0000000020000100 RSI: 00000000000089a0 RDI: 0000000000000008 RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006ae R14: 00000000004c96ce R15: 000000000076bfac Showing all locks held in the system: 1 lock held by khungtaskd/1056: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544 2 locks held by agetty/6043: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156 2 locks held by agetty/6045: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e4/0x16f0 drivers/tty/n_tty.c:2156 3 locks held by kworker/0:12/25997: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] work_static include/linux/workqueue.h:199 [inline] #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] set_work_data kernel/workqueue.c:619 [inline] #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] process_one_work+0x727/0x1540 kernel/workqueue.c:2087 #1: ((addr_chk_work).work){+.+.}, at: [] process_one_work+0x761/0x1540 kernel/workqueue.c:2091 #2: (rtnl_mutex){+.+.}, at: [] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4408 1 lock held by syz-executor.2/26011: #0: (rtnl_mutex){+.+.}, at: [] tun_detach drivers/net/tun.c:585 [inline] #0: (rtnl_mutex){+.+.}, at: [] tun_chr_close+0x34/0x60 drivers/net/tun.c:2671 1 lock held by syz-executor.0/26344: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x450 net/socket.c:1036 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1056 Comm: khungtaskd Not tainted 4.14.175-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e2/0xb80 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 26343 Comm: syz-executor.0 Not tainted 4.14.175-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888076f18040 task.stack: ffff888047d28000 RIP: 0010:mark_lock+0xc/0x10b0 kernel/locking/lockdep.c:3158 RSP: 0000:ffff8880aeb07cb0 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1100ede3130 RDX: 0000000000000008 RSI: ffff888076f18960 RDI: ffff888076f18040 RBP: ffff8880aeb07e68 R08: 0000000000000001 R09: 00000000000c48d2 R10: ffff888076f18960 R11: ffff888076f18040 R12: ffff88801a413f98 R13: 00000000000008d2 R14: 0000000000000004 R15: ffff888076f18982 FS: 00007ff6e6488700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000483bb888 CR3: 000000001aca0000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __lock_acquire+0x5f7/0x4620 kernel/locking/lockdep.c:3448 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:160 kill_fasync_rcu fs/fcntl.c:990 [inline] kill_fasync fs/fcntl.c:1011 [inline] kill_fasync+0x11e/0x3c0 fs/fcntl.c:1004 perf_event_wakeup+0x20c/0x350 kernel/events/core.c:5569 perf_pending_event+0xa5/0xd0 kernel/events/core.c:5593 irq_work_run_list+0xf0/0x160 kernel/irq_work.c:156 irq_work_run+0x4e/0xb0 kernel/irq_work.c:171 smp_irq_work_interrupt+0xa3/0x4e0 arch/x86/kernel/irq_work.c:21 irq_work_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:823 RIP: 0010:qlist_free_all+0x101/0x140 mm/kasan/quarantine.c:161 RSP: 0000:ffff888047d2f8b8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff09 RAX: 0000000000000007 RBX: ffff8880771bec40 RCX: 1ffff1100ede3121 RDX: 0000000000000000 RSI: ffff888076f18910 RDI: 0000000000000282 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880771beb60 R13: ffff888047d2f8f0 R14: ffff88821f8c1b00 R15: 0000000000000282 quarantine_reduce+0x140/0x170 mm/kasan/quarantine.c:259 kasan_kmalloc+0x95/0xe0 mm/kasan/kasan.c:536 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc_node mm/slab.c:3333 [inline] kmem_cache_alloc_node+0x135/0x7a0 mm/slab.c:3640 __alloc_skb+0x9a/0x4c0 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:980 [inline] nlmsg_new include/net/netlink.h:511 [inline] mpls_netconf_notify_devconf+0x41/0xf0 net/mpls/af_mpls.c:1158 mpls_dev_notify+0x4ca/0x691 net/mpls/af_mpls.c:1544 notifier_call_chain+0x107/0x1a0 kernel/notifier.c:93 call_netdevice_notifiers net/core/dev.c:1687 [inline] rollback_registered_many+0x694/0xa70 net/core/dev.c:7205 rollback_registered+0xd6/0x180 net/core/dev.c:7247 unregister_netdevice_queue net/core/dev.c:8259 [inline] unregister_netdevice_queue+0x1a1/0x220 net/core/dev.c:8252 br_del_bridge+0xa9/0xe0 net/bridge/br_if.c:419 br_ioctl_deviceless_stub+0x1ff/0x5f0 net/bridge/br_ioctl.c:380 sock_ioctl+0x254/0x450 net/socket.c:1038 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c889 RSP: 002b:00007ff6e6487c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff6e64886d4 RCX: 000000000045c889 RDX: 00000000200000c0 RSI: 00000000000089a1 RDI: 0000000000000008 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006b1 R14: 00000000004c9721 R15: 000000000076bf0c Code: c3 0f 0b 48 c7 c7 48 67 d1 87 e8 90 d8 3d 00 eb 8a 48 c7 c7 00 0a 66 8a e8 72 d8 3d 00 eb c3 48 b8 00 00 00 00 00 fc ff df 41 57 <89> d1 41 89 d7 41 56 49 89 fe 41 55 4c 8d 6e 20 4c 89 ea 41 54