INFO: task syz-executor.1:16591 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:25720 pid:16591 ppid: 6569 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6236 schedule+0xd3/0x270 kernel/sched/core.c:6315 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 flush_workqueue+0x3ed/0x15b0 kernel/workqueue.c:2869 nbd_start_device_ioctl drivers/block/nbd.c:1359 [inline] __nbd_ioctl drivers/block/nbd.c:1422 [inline] nbd_ioctl+0x631/0xa80 drivers/block/nbd.c:1462 blkdev_ioctl+0x2a1/0x700 block/ioctl.c:589 block_ioctl+0xfa/0x140 block/fops.c:477 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f379567f739 RSP: 002b:00007f3792bf6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3795783f80 RCX: 00007f379567f739 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00007f37956d9cc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3795783f80 R13: 00007fff9c054cef R14: 00007f3792bf6300 R15: 0000000000022000 INFO: task syz-executor.1:16591 blocked for more than 143 seconds. Not tainted 5.15.0-rc1-next-20210916-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:25720 pid:16591 ppid: 6569 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6236 schedule+0xd3/0x270 kernel/sched/core.c:6315 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 flush_workqueue+0x3ed/0x15b0 kernel/workqueue.c:2869 nbd_start_device_ioctl drivers/block/nbd.c:1359 [inline] __nbd_ioctl drivers/block/nbd.c:1422 [inline] nbd_ioctl+0x631/0xa80 drivers/block/nbd.c:1462 blkdev_ioctl+0x2a1/0x700 block/ioctl.c:589 block_ioctl+0xfa/0x140 block/fops.c:477 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f379567f739 RSP: 002b:00007f3792bf6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3795783f80 RCX: 00007f379567f739 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00007f37956d9cc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3795783f80 R13: 00007fff9c054cef R14: 00007f3792bf6300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b980020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6231: #0: ffff888073078af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by kworker/u5:3/6840: #0: ffff88807e0b1938 ((wq_completion)knbd1-recv){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88807e0b1938 ((wq_completion)knbd1-recv){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88807e0b1938 ((wq_completion)knbd1-recv){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff88807e0b1938 ((wq_completion)knbd1-recv){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff88807e0b1938 ((wq_completion)knbd1-recv){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff88807e0b1938 ((wq_completion)knbd1-recv){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268 #1: ffffc90004ccfdb0 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2272 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc1-next-20210916-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+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2957 Comm: systemd-journal Not tainted 5.15.0-rc1-next-20210916-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:putname+0xff/0x140 fs/namei.c:271 Code: e6 e8 25 99 f0 ff 48 89 ef e8 ed 40 f0 ff 5b 5d 41 5c 41 5d e9 92 ba aa ff e8 8d ba aa ff 48 89 ee 4c 89 ef e8 02 99 f0 ff 5b <5d> 41 5c 41 5d e9 77 ba aa ff e8 72 ba aa ff 0f 0b e8 7b dd f0 ff RSP: 0018:ffffc900024afe40 EFLAGS: 00000296 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff88808b2ab300 R08: 0000000000000000 R09: ffff8880b9d32a0b R10: ffffed10173a6541 R11: 0000000000000000 R12: ffff88808b2ab320 R13: ffff888010dc53c0 R14: ffff88808b2ab300 R15: 0000000000000000 FS: 00007f45ca4858c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f45c7acc000 CR3: 000000001d261000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_mkdirat+0x1cd/0x300 fs/namei.c:3920 __do_sys_mkdir fs/namei.c:3931 [inline] __se_sys_mkdir fs/namei.c:3929 [inline] __x64_sys_mkdir+0xf2/0x140 fs/namei.c:3929 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f45c9740687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffc5b48a258 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffc5b48d2c0 RCX: 00007f45c9740687 RDX: 0000000000000000 RSI: 00000000000001ed RDI: 000056357b4d78a0 RBP: 00007ffc5b48a290 R08: 0000563579f473e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 000056357b4d78a0 R15: 00007ffc5b48a8d0 ---------------- Code disassembly (best guess): 0: e6 e8 out %al,$0xe8 2: 25 99 f0 ff 48 and $0x48fff099,%eax 7: 89 ef mov %ebp,%edi 9: e8 ed 40 f0 ff callq 0xfff040fb e: 5b pop %rbx f: 5d pop %rbp 10: 41 5c pop %r12 12: 41 5d pop %r13 14: e9 92 ba aa ff jmpq 0xffaabaab 19: e8 8d ba aa ff callq 0xffaabaab 1e: 48 89 ee mov %rbp,%rsi 21: 4c 89 ef mov %r13,%rdi 24: e8 02 99 f0 ff callq 0xfff0992b 29: 5b pop %rbx * 2a: 5d pop %rbp <-- trapping instruction 2b: 41 5c pop %r12 2d: 41 5d pop %r13 2f: e9 77 ba aa ff jmpq 0xffaabaab 34: e8 72 ba aa ff callq 0xffaabaab 39: 0f 0b ud2 3b: e8 7b dd f0 ff callq 0xfff0ddbb