NOHZ: local_softirq_pending 08 net_ratelimit: 68 callbacks suppressed GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.5:17832 blocked for more than 140 seconds. Not tainted 4.14.193-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29128 17832 6356 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1731 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 flush_workqueue+0x3ce/0x1310 kernel/workqueue.c:2676 nbd_start_device_ioctl drivers/block/nbd.c:1254 [inline] __nbd_ioctl drivers/block/nbd.c:1325 [inline] nbd_ioctl+0x49d/0xa80 drivers/block/nbd.c:1365 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1883 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 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+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007f197cd69c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000011c00 RCX: 000000000045d239 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fffb292d82f R14: 00007f197cd6a9c0 R15: 000000000118cf4c Showing all locks held in the system: 1 lock held by khungtaskd/1065: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/5962: #0: (&p->pi_lock){-.-.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:769 2 locks held by kworker/u5:4/6428: #0: ("knbd%d-recv"nbd->index){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((&args->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1065 Comm: khungtaskd Not tainted 4.14.193-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+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f 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+0x5b9/0xb40 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3642 Comm: systemd-journal Not tainted 4.14.193-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880944820c0 task.stack: ffff888094488000 RIP: 0010:do_inode_permission fs/namei.c:382 [inline] RIP: 0010:__inode_permission+0x3b/0x2f0 fs/namei.c:426 RSP: 0018:ffff88809448fab8 EFLAGS: 00000a06 RAX: dffffc0000000000 RBX: ffff8880a9c36b00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000081 RDI: ffff88808da48330 RBP: ffff88808da48330 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: ffff8880944820c0 R12: ffff88808da48332 R13: 0000000000000081 R14: 392f009514538c24 R15: ffff88804daba825 FS: 00007eff5e0078c0(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007eff5a699018 CR3: 0000000094cd9000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inode_permission fs/namei.c:476 [inline] may_lookup fs/namei.c:1711 [inline] link_path_walk+0x16f/0x10a0 fs/namei.c:2097 path_openat+0x15e/0x2970 fs/namei.c:3568 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: 0033:0x7eff5d597840 RSP: 002b:00007ffee586bc08 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffee586bf10 RCX: 00007eff5d597840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055ae9a49ec80 RBP: 000000000000000d R08: 00000000000001e0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055ae9a491060 R14: 00007ffee586bed0 R15: 000055ae9a49eaa0 Code: 2d cc ff 41 f6 c5 02 0f 85 bc 00 00 00 e8 7e 2d cc ff 4c 8d 65 02 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 0f b6 14 02 <4c> 89 e0 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 05 02 00 00