INFO: task syz-executor.0:4828 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27088 pid: 4828 ppid: 6527 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6253 schedule+0x12b/0x1f0 kernel/sched/core.c:6326 blk_mq_freeze_queue_wait+0x105/0x190 block/blk-mq.c:178 nbd_add_socket+0x17b/0x8e0 drivers/block/nbd.c:1109 __nbd_ioctl drivers/block/nbd.c:1454 [inline] nbd_ioctl+0x263/0xb80 drivers/block/nbd.c:1511 blkdev_ioctl+0x3ac/0x790 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f808611bae9 RSP: 002b:00007f8083691188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f808622ef60 RCX: 00007f808611bae9 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00007f8086175f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc9a2135f R14: 00007f8083691300 R15: 0000000000022000 INFO: task syz-executor.0:4831 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27088 pid: 4831 ppid: 6527 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6253 schedule+0x12b/0x1f0 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common+0xd1f/0x2590 kernel/locking/mutex.c:680 __mutex_lock kernel/locking/mutex.c:740 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:792 nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 blkdev_ioctl+0x3ac/0x790 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f808611bae9 RSP: 002b:00007f8083670188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f808622f020 RCX: 00007f808611bae9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00007f8086175f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc9a2135f R14: 00007f8083670300 R15: 0000000000022000 INFO: task syz-executor.0:4835 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28688 pid: 4835 ppid: 6527 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6253 schedule+0x12b/0x1f0 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common+0xd1f/0x2590 kernel/locking/mutex.c:680 __mutex_lock kernel/locking/mutex.c:740 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:792 nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 blkdev_ioctl+0x3ac/0x790 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f808611bae9 RSP: 002b:00007f808364f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f808622f0e0 RCX: 00007f808611bae9 RDX: 0000000000000000 RSI: 000000000000ab04 RDI: 0000000000000006 RBP: 00007f8086175f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc9a2135f R14: 00007f808364f300 R15: 0000000000022000 INFO: task syz-executor.0:4858 blocked for more than 144 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27088 pid: 4858 ppid: 6527 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6253 schedule+0x12b/0x1f0 kernel/sched/core.c:6326 __bio_queue_enter+0x35a/0x690 block/blk-core.c:441 bio_queue_enter block/blk.h:91 [inline] blk_mq_get_request block/blk-mq.c:2588 [inline] blk_mq_submit_bio+0x7c9/0x2750 block/blk-mq.c:2632 __submit_bio+0x15d/0x330 block/blk-core.c:849 __submit_bio_noacct_mq block/blk-core.c:924 [inline] submit_bio_noacct+0x844/0x9e0 block/blk-core.c:950 submit_bio+0x2d2/0x520 block/blk-core.c:1011 submit_bio_wait+0x101/0x200 block/bio.c:1254 blkdev_issue_flush+0x17b/0x230 block/blk-flush.c:458 blkdev_fsync+0x73/0xa0 block/fops.c:474 vfs_fsync_range fs/sync.c:182 [inline] vfs_fsync fs/sync.c:196 [inline] do_fsync fs/sync.c:206 [inline] __do_sys_fdatasync fs/sync.c:219 [inline] __se_sys_fdatasync fs/sync.c:217 [inline] __x64_sys_fdatasync+0xb1/0x100 fs/sync.c:217 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f808611bae9 RSP: 002b:00007f808362e188 EFLAGS: 00000246 ORIG_RAX: 000000000000004b RAX: ffffffffffffffda RBX: 00007f808622f1a0 RCX: 00007f808611bae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f8086175f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc9a2135f R14: 00007f808362e300 R15: 0000000000022000 INFO: task syz-executor.0:4861 blocked for more than 144 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28688 pid: 4861 ppid: 6527 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6253 schedule+0x12b/0x1f0 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common+0xd1f/0x2590 kernel/locking/mutex.c:680 __mutex_lock kernel/locking/mutex.c:740 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:792 nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 blkdev_ioctl+0x3ac/0x790 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f808611bae9 RSP: 002b:00007f808360d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f808622f260 RCX: 00007f808611bae9 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00007f8086175f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc9a2135f R14: 00007f808360d300 R15: 0000000000022000 INFO: task syz-executor.0:4862 blocked for more than 144 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27088 pid: 4862 ppid: 6527 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6253 schedule+0x12b/0x1f0 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common+0xd1f/0x2590 kernel/locking/mutex.c:680 __mutex_lock kernel/locking/mutex.c:740 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:792 nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 blkdev_ioctl+0x3ac/0x790 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f808611bae9 RSP: 002b:00007f80835ec188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f808622f320 RCX: 00007f808611bae9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00007f8086175f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc9a2135f R14: 00007f80835ec300 R15: 0000000000022000 INFO: task syz-executor.0:4863 blocked for more than 144 seconds. Not tainted 5.16.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28688 pid: 4863 ppid: 6527 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6253 schedule+0x12b/0x1f0 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common+0xd1f/0x2590 kernel/locking/mutex.c:680 __mutex_lock kernel/locking/mutex.c:740 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:792 nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 blkdev_ioctl+0x3ac/0x790 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f808611bae9 RSP: 002b:00007f80835cb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f808622f3e0 RCX: 00007f808611bae9 RDX: 0000000000000000 RSI: 000000000000ab04 RDI: 0000000000000006 RBP: 00007f8086175f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc9a2135f R14: 00007f80835cb300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8cd1db00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by kworker/u4:3/54: #0: ffff8880b9a395d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x110 kernel/sched/core.c:478 #1: ffff8880b9a27888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x46c/0x780 kernel/sched/psi.c:871 1 lock held by systemd-journal/2965: 1 lock held by syz-executor.0/4828: #0: ffff88801b4f4998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 1 lock held by syz-executor.0/4831: #0: ffff88801b4f4998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 1 lock held by syz-executor.0/4835: #0: ffff88801b4f4998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 1 lock held by syz-executor.0/4861: #0: ffff88801b4f4998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 1 lock held by syz-executor.0/4862: #0: ffff88801b4f4998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 1 lock held by syz-executor.0/4863: #0: ffff88801b4f4998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x148/0xb80 drivers/block/nbd.c:1504 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc82/0xcd0 kernel/hung_task.c:295 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2981 Comm: kworker/0:4 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:check_preemption_disabled+0x1/0x1c0 lib/smp_processor_id.c:13 Code: cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 48 c7 c7 e0 46 f5 8a 48 c7 c6 20 47 f5 8a eb 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 10 49 89 f6 49 89 ff 65 48 8b RSP: 0018:ffffc90001a8f8d0 EFLAGS: 00000046 RAX: 0000000000000004 RBX: ffff88801d75c520 RCX: ffffffff81665dc1 RDX: dffffc0000000000 RSI: ffffffff8a8f16c0 RDI: ffffffff8af54760 RBP: ffffc90001a8f9a0 R08: dffffc0000000000 R09: fffffbfff2034df9 R10: fffffbfff2034df9 R11: 0000000000000000 R12: 0000000000000004 R13: ffff88801d75c458 R14: ffff88801d75ba00 R15: 1ffff11003aeb88b FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f031c29e000 CR3: 0000000070575000 CR4: 00000000003506f0 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:438 [inline] lockdep_hardirqs_on_prepare+0x412/0x780 kernel/locking/lockdep.c:4293 trace_hardirqs_on+0x6f/0x80 kernel/trace/trace_preemptirq.c:49 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x8b/0x130 kernel/locking/spinlock.c:194 _get_random_bytes+0x1cf/0x230 eth_random_addr include/linux/etherdevice.h:232 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:753 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:802 [inline] nsim_dev_trap_report_work+0x34c/0xaf0 drivers/net/netdevsim/dev.c:843 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: cc int3 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: cc int3 8: cc int3 9: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) e: 48 c7 c7 e0 46 f5 8a mov $0xffffffff8af546e0,%rdi 15: 48 c7 c6 20 47 f5 8a mov $0xffffffff8af54720,%rsi 1c: eb 0b jmp 0x29 1e: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 25: 00 00 00 28: 90 nop 29: 55 push %rbp * 2a: 41 57 push %r15 <-- trapping instruction 2c: 41 56 push %r14 2e: 41 55 push %r13 30: 41 54 push %r12 32: 53 push %rbx 33: 48 83 ec 10 sub $0x10,%rsp 37: 49 89 f6 mov %rsi,%r14 3a: 49 89 ff mov %rdi,%r15 3d: 65 gs 3e: 48 rex.W 3f: 8b .byte 0x8b