INFO: task syz-executor.0:8794 blocked for more than 143 seconds. Not tainted 5.13.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:24720 pid: 8794 ppid: 8445 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5940 schedule+0x14b/0x210 kernel/sched/core.c:6019 schedule_timeout+0x98/0x2f0 kernel/time/timer.c:1868 do_wait_for_common+0x2da/0x480 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 __flush_work kernel/workqueue.c:3053 [inline] __cancel_work_timer+0x4dc/0x690 kernel/workqueue.c:3140 p9_conn_destroy net/9p/trans_fd.c:891 [inline] p9_fd_close+0x2a2/0x3c0 net/9p/trans_fd.c:921 p9_client_create+0xa28/0xf80 net/9p/client.c:1071 v9fs_session_init+0x1e6/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x72/0x870 fs/9p/vfs_super.c:126 legacy_get_tree+0xea/0x180 fs/fs_context.c:592 vfs_get_tree+0x86/0x270 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x196f/0x2be0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f2e5b739188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c1a8 RCX: 00000000004665d9 RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 00000000004bfcb9 R08: 0000000020000580 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c1a8 R13: 00007fffb081cc8f R14: 00007f2e5b739300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1640: #0: ffffffff8cf179c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 2 locks held by kworker/0:3/4823: #0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc9000afa7d20 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 1 lock held by in:imklog/8125: #0: ffff88801fb1e5f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1640 Comm: khungtaskd Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0x1d3/0x29f lib/dump_stack.c:96 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd06/0xd50 kernel/hung_task.c:294 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4854 Comm: systemd-journal Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_preemption_disabled+0x7e/0x180 lib/smp_processor_id.c:19 Code: 04 25 28 00 00 00 48 3b 44 24 08 0f 85 0f 01 00 00 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 9c 8f 04 24 4c 8b 24 24 00 02 00 00 be 00 02 00 00 4c 21 e6 31 ff 0f 1f 44 00 00 4c 21 RSP: 0018:ffffc9000132fe18 EFLAGS: 00000046 RAX: d5f9163bc4276200 RBX: 0000000000000000 RCX: 1ffffffff1f4b400 RDX: 1ffffffff1f4b400 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff8fa5a000 R09: ffffffff8fa5a008 R10: ffffffff8fa5a01c R11: ffffffff8fa5a010 R12: 0000000000000046 R13: dffffc0000000000 R14: ffffffff8a933fa0 R15: ffffffff8a933f60 FS: 00007fb8fd4328c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb8fa80e000 CR3: 00000000151bd000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: account_steal_time kernel/sched/cputime.c:210 [inline] steal_account_process_time kernel/sched/cputime.c:244 [inline] account_other_time+0x18e/0x280 kernel/sched/cputime.c:262 get_vtime_delta kernel/sched/cputime.c:656 [inline] vtime_account_system kernel/sched/cputime.c:666 [inline] vtime_user_enter+0xfd/0x2d0 kernel/sched/cputime.c:710 __context_tracking_enter+0xa5/0xf0 kernel/context_tracking.c:82 user_enter_irqoff include/linux/context_tracking.h:41 [inline] __exit_to_user_mode kernel/entry/common.c:130 [inline] syscall_exit_to_user_mode+0x5b/0x60 kernel/entry/common.c:304 do_syscall_64+0x4c/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb8fc6caf17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffc847d69d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: 00000000000012f6 RBX: 000055b8cef281e0 RCX: 00007fb8fc6caf17 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055b8cef281e0 RBP: 00007ffc847d6ad0 R08: 00007ffc847dc080 R09: 0000000000000000 R10: 00007ffc847dc0a8 R11: 0000000000000202 R12: 00000000000012f6 R13: 00007fb8fd134147 R14: 0000000000000000 R15: 0005c6d980c986e5