INFO: task syz-executor137:7905 can't die for more than 143 seconds. task:syz-executor137 state:D stack:27968 pid: 7905 ppid: 6606 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4698 [inline] __schedule+0x949/0x2710 kernel/sched/core.c:5955 schedule+0xd3/0x290 kernel/sched/core.c:6034 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_work+0x50e/0xad0 kernel/workqueue.c:3053 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3140 p9_conn_destroy net/9p/trans_fd.c:886 [inline] p9_fd_close+0x29c/0x520 net/9p/trans_fd.c:921 p9_client_destroy+0xbe/0x370 net/9p/client.c:1088 v9fs_session_close+0x45/0x2c0 fs/9p/v9fs.c:498 v9fs_kill_super+0x49/0x90 fs/9p/vfs_super.c:224 deactivate_locked_super+0x94/0x160 fs/super.c:335 v9fs_mount+0x7d0/0x9c0 fs/9p/vfs_super.c:205 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:2978 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3308 do_mount fs/namespace.c:3321 [inline] __do_sys_mount fs/namespace.c:3529 [inline] __se_sys_mount fs/namespace.c:3506 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3506 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: 0033:0x445c19 RSP: 002b:00007f8953c232f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000445c19 RDX: 0000000020000140 RSI: 00000000200002c0 RDI: 0000000000000000 RBP: 000000000049b07c R08: 0000000020000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 613d737365636361 R14: 64663d736e617274 R15: 00000000004cb4e8 INFO: task syz-executor137:7905 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-next-20210809-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor137 state:D stack:27968 pid: 7905 ppid: 6606 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4698 [inline] __schedule+0x949/0x2710 kernel/sched/core.c:5955 schedule+0xd3/0x290 kernel/sched/core.c:6034 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_work+0x50e/0xad0 kernel/workqueue.c:3053 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3140 p9_conn_destroy net/9p/trans_fd.c:886 [inline] p9_fd_close+0x29c/0x520 net/9p/trans_fd.c:921 p9_client_destroy+0xbe/0x370 net/9p/client.c:1088 v9fs_session_close+0x45/0x2c0 fs/9p/v9fs.c:498 v9fs_kill_super+0x49/0x90 fs/9p/vfs_super.c:224 deactivate_locked_super+0x94/0x160 fs/super.c:335 v9fs_mount+0x7d0/0x9c0 fs/9p/vfs_super.c:205 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:2978 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3308 do_mount fs/namespace.c:3321 [inline] __do_sys_mount fs/namespace.c:3529 [inline] __se_sys_mount fs/namespace.c:3506 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3506 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: 0033:0x445c19 RSP: 002b:00007f8953c232f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004cb4e0 RCX: 0000000000445c19 RDX: 0000000020000140 RSI: 00000000200002c0 RDI: 0000000000000000 RBP: 000000000049b07c R08: 0000000020000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 613d737365636361 R14: 64663d736e617274 R15: 00000000004cb4e8 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97e940 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 2 locks held by kworker/0:2/1280: #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x1630 kernel/workqueue.c:2247 #1: ffffc90005437db0 ((work_completion)(&m->rq)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 kernel/workqueue.c:2251 2 locks held by systemd-udevd/2985: #0: ffff8880b9c31a18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:460 [inline] #0: ffff8880b9c31a18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1309 [inline] #0: ffff8880b9c31a18 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1612 [inline] #0: ffff8880b9c31a18 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x233/0x2710 kernel/sched/core.c:5869 #1: ffff8880b9c1f988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39d/0x480 kernel/sched/psi.c:880 1 lock held by in:imklog/6288: 2 locks held by kworker/1:3/6293: #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff888010864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x1630 kernel/workqueue.c:2247 #1: ffffc9000c7d7db0 ((work_completion)(&m->rq)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 kernel/workqueue.c:2251 1 lock held by syz-executor137/26095: #0: ffffffff8ba820a8 (slab_mutex){+.+.}-{3:3}, at: kmem_cache_destroy+0x1e/0x120 mm/slab_common.c:505 1 lock held by syz-executor137/26109: #0: ffffffff8ba820a8 (slab_mutex){+.+.}-{3:3}, at: kmem_cache_destroy+0x1e/0x120 mm/slab_common.c:505 1 lock held by syz-executor137/26103: 1 lock held by syz-executor137/26113: #0: ffffffff8ba820a8 (slab_mutex){+.+.}-{3:3}, at: kmem_cache_destroy+0x1e/0x120 mm/slab_common.c:505 1 lock held by syz-executor137/26135: #0: ffffffff8ba820a8 (slab_mutex){+.+.}-{3:3}, at: kmem_cache_create_usercopy+0x38/0x2e0 mm/slab_common.c:330 1 lock held by syz-executor137/26137: #0: ffffffff8ba820a8 (slab_mutex){+.+.}-{3:3}, at: kmem_cache_create_usercopy+0x38/0x2e0 mm/slab_common.c:330 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210809-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:105 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: 2972 Comm: systemd-journal Not tainted 5.14.0-rc5-next-20210809-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] RIP: 0010:_raw_spin_lock_irq+0x3c/0x50 kernel/locking/spinlock.c:167 Code: 6a 9e 1e f8 45 31 c9 41 b8 01 00 00 00 31 c9 ff 74 24 08 48 8d 7d 18 31 d2 31 f6 e8 7e 42 2a f8 48 89 ef 58 5d e9 d4 ac 2a f8 2f ed 4a f8 eb c9 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 54 RSP: 0018:ffffc90002aefeb8 EFLAGS: 00000002 RAX: 0000000000000293 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88807bfbd580 RSI: ffffffff814cd235 RDI: ffff88807bfbde98 RBP: ffff88807bfbde98 R08: 0000000000000001 R09: ffff88807bfbde07 R10: ffffed100f7f7bc0 R11: 0000000000000000 R12: ffff88807bfbde98 R13: ffff88807bfbd580 R14: 0000000000000000 R15: ffff88806ef15900 FS: 00007f6a591608c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6a569fe000 CR3: 0000000018fab000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: task_work_run+0xb4/0x1a0 kernel/task_work.c:159 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6a586ef840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffdb12ccec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007ffdb12cd1d0 RCX: 00007f6a586ef840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055f1f33815c0 RBP: 000000000000000d R08: 00000000000001e0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055f1f3374040 R14: 00007ffdb12cd190 R15: 000055f1f3381610