block nbd2: shutting down sockets print_req_error: I/O error, dev nbd2, sector 0 block nbd2: Device being setup by another task block nbd2: NBD_DISCONNECT block nbd2: Send disconnect failed -32 INFO: task syz-executor.3:24489 blocked for more than 140 seconds. Not tainted 4.14.286-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29264 24489 8006 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 blk_mq_freeze_queue_wait+0xf8/0x1f0 block/blk-mq.c:154 nbd_add_socket+0x158/0x7e0 drivers/block/nbd.c:959 __nbd_ioctl drivers/block/nbd.c:1307 [inline] nbd_ioctl+0x67e/0xac0 drivers/block/nbd.c:1374 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1893 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: 0033:0x7fae9573e109 RSP: 002b:00007fae940b3168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fae95850f60 RCX: 00007fae9573e109 RDX: 0000000000000007 RSI: 000000000000ab00 RDI: 0000000000000006 RBP: 00007fae9579805d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd1b369e9f R14: 00007fae940b3300 R15: 0000000000022000 INFO: task syz-executor.3:24503 blocked for more than 140 seconds. Not tainted 4.14.286-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29416 24503 8006 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 nbd_ioctl+0x11f/0xac0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1893 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: 0033:0x7fae9573e109 RSP: 002b:00007fae94092168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fae95851030 RCX: 00007fae9573e109 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005 RBP: 00007fae9579805d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd1b369e9f R14: 00007fae94092300 R15: 0000000000022000 INFO: task syz-executor.3:24514 blocked for more than 140 seconds. Not tainted 4.14.286-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D30168 24514 8006 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 nbd_ioctl+0x11f/0xac0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1893 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: 0033:0x7fae9573e109 RSP: 002b:00007fae94071168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fae95851100 RCX: 00007fae9573e109 RDX: 0000000000000000 RSI: 000000000000ab08 RDI: 0000000000000005 RBP: 00007fae9579805d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd1b369e9f R14: 00007fae94071300 R15: 0000000000022000 INFO: task syz-executor.3:24522 blocked for more than 140 seconds. Not tainted 4.14.286-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D30168 24522 8006 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 nbd_ioctl+0x11f/0xac0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1893 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: 0033:0x7fae9573e109 RSP: 002b:00007fae94050168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fae958511d0 RCX: 00007fae9573e109 RDX: 0000000000000005 RSI: 000000000000ab07 RDI: 0000000000000004 RBP: 00007fae9579805d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd1b369e9f R14: 00007fae94050300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1518: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor.3/24489: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x11f/0xac0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/24503: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x11f/0xac0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/24514: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x11f/0xac0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/24522: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x11f/0xac0 drivers/block/nbd.c:1367 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1518 Comm: khungtaskd Not tainted 4.14.286-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 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: 4625 Comm: systemd-journal Not tainted 4.14.286-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 task: ffff8880a12be180 task.stack: ffff8880a12c0000 RIP: 0010:deref_stack_reg+0x28/0x1a0 arch/x86/kernel/unwind_orc.c:285 RSP: 0018:ffff8880a12c7a28 EFLAGS: 00000096 RAX: dffffc0000000000 RBX: 1ffff11014258f5b RCX: ffffffff8a6b7fb0 RDX: ffff8880a12c7ba8 RSI: ffff8880a12c7e58 RDI: ffff8880a12c7b60 RBP: ffff8880a12c7e58 R08: ffffffff8a6b7fb4 R09: ffffffff8a6b7fb5 R10: 000000000000c41b R11: 0000000000000001 R12: ffff8880a12c7b60 R13: ffff8880a12c7ba8 R14: ffff8880a12c7bb0 R15: ffff8880a12c7b60 FS: 00007f721fb608c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f721d177000 CR3: 00000000a12e4000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0xc98/0x17d0 arch/x86/kernel/unwind_orc.c:425 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758 __put_cred+0x1a1/0x210 kernel/cred.c:151 put_cred include/linux/cred.h:274 [inline] SYSC_faccessat fs/open.c:444 [inline] SyS_faccessat+0x52a/0x680 fs/open.c:353 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f721ee1b9c7 RSP: 002b:00007ffc2388bee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffc2388ee00 RCX: 00007f721ee1b9c7 RDX: 00007f721f88ca00 RSI: 0000000000000000 RDI: 000055a9ed4f49a3 RBP: 00007ffc2388bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffc2388ee00 R15: 00007ffc2388c410 Code: 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 56 41 55 49 89 d5 41 54 49 89 fc 55 48 89 f5 53 48 83 ec 48 48 c7 44 24 08 b3 8a b5 41 <48> 8d 5c 24 08 48 c7 44 24 10 68 5d b5 88 48 c1 eb 03 48 c7 44 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 00 00 add %al,(%rax) 2: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 9: fc ff df c: 41 56 push %r14 e: 41 55 push %r13 10: 49 89 d5 mov %rdx,%r13 13: 41 54 push %r12 15: 49 89 fc mov %rdi,%r12 18: 55 push %rbp 19: 48 89 f5 mov %rsi,%rbp 1c: 53 push %rbx 1d: 48 83 ec 48 sub $0x48,%rsp 21: 48 c7 44 24 08 b3 8a movq $0x41b58ab3,0x8(%rsp) 28: b5 41 * 2a: 48 8d 5c 24 08 lea 0x8(%rsp),%rbx <-- trapping instruction 2f: 48 c7 44 24 10 68 5d movq $0xffffffff88b55d68,0x10(%rsp) 36: b5 88 38: 48 c1 eb 03 shr $0x3,%rbx 3c: 48 rex.W 3d: c7 .byte 0xc7 3e: 44 rex.R