INFO: task syz-executor.1:4994 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:27552 pid: 4994 ppid: 6547 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4756 [inline] __schedule+0x943/0x2700 kernel/sched/core.c:6029 schedule+0xd7/0x280 kernel/sched/core.c:6108 schedule_timeout+0x1e0/0x2a0 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_work+0x57e/0xb20 kernel/workqueue.c:3083 __cancel_work_timer+0x3fa/0x570 kernel/workqueue.c:3170 p9_conn_destroy net/9p/trans_fd.c:891 [inline] p9_fd_close+0x305/0x530 net/9p/trans_fd.c:921 p9_client_create+0x95a/0x1110 net/9p/client.c:1071 v9fs_session_init+0x1dd/0x17d0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x9d0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2992 [inline] path_mount+0x134d/0x1fe0 fs/namespace.c:3322 do_mount fs/namespace.c:3335 [inline] __do_sys_mount fs/namespace.c:3543 [inline] __se_sys_mount fs/namespace.c:3520 [inline] __x64_sys_mount+0x281/0x300 fs/namespace.c:3520 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007fa927a00188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000100 RSI: 0000000020000080 RDI: 0000000000feffff RBP: 00000000004bfcc4 R08: 0000000020000180 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcbd4eb62f R14: 00007fa927a00300 R15: 0000000000022000 INFO: task syz-executor.1:4994 blocked for more than 143 seconds. Not tainted 5.14.0-rc6-next-20210820-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27552 pid: 4994 ppid: 6547 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4756 [inline] __schedule+0x943/0x2700 kernel/sched/core.c:6029 schedule+0xd7/0x280 kernel/sched/core.c:6108 schedule_timeout+0x1e0/0x2a0 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_work+0x57e/0xb20 kernel/workqueue.c:3083 __cancel_work_timer+0x3fa/0x570 kernel/workqueue.c:3170 p9_conn_destroy net/9p/trans_fd.c:891 [inline] p9_fd_close+0x305/0x530 net/9p/trans_fd.c:921 p9_client_create+0x95a/0x1110 net/9p/client.c:1071 v9fs_session_init+0x1dd/0x17d0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x9d0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2992 [inline] path_mount+0x134d/0x1fe0 fs/namespace.c:3322 do_mount fs/namespace.c:3335 [inline] __do_sys_mount fs/namespace.c:3543 [inline] __se_sys_mount fs/namespace.c:3520 [inline] __x64_sys_mount+0x281/0x300 fs/namespace.c:3520 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 RSP: 002b:00007fa927a00188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000100 RSI: 0000000020000080 RDI: 0000000000feffff RBP: 00000000004bfcc4 R08: 0000000020000180 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcbd4eb62f R14: 00007fa927a00300 R15: 0000000000022000 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc6-next-20210820-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+0xccb/0xef0 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6234 Comm: rs:main Q:Reg Not tainted 5.14.0-rc6-next-20210820-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x56169fa3393d Code: 10 01 0f 84 4d 01 00 00 48 8b 83 50 02 00 00 48 85 c0 75 61 48 8b 4c 24 28 64 48 33 0c 25 28 00 00 00 89 e8 0f 85 be 01 00 00 <48> 83 c4 30 5b 5d 41 5c 41 5d 41 5e c3 66 0f 1f 44 00 00 8b 54 24 RSP: 002b:00007fc8d555ea00 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00007fc8cc025670 RCX: 0000000000000000 RDX: 0000000000000524 RSI: 00007fc8cc0258f0 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00007fc8cc0258f0 R13: 000056169fc9ebec R14: 00005616a0dde360 R15: 000000000000000e FS: 00007fc8d555f700 GS: 0000000000000000