INFO: task syz-executor.0:10107 blocked for more than 143 seconds. Not tainted 5.14.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27920 pid:10107 ppid: 8472 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5940 schedule+0xd3/0x270 kernel/sched/core.c:6019 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1854 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:891 [inline] p9_fd_close+0x305/0x520 net/9p/trans_fd.c:921 p9_client_create+0x95a/0x1110 net/9p/client.c:1071 v9fs_session_init+0x1dd/0x17b0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x9c0 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:2905 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount fs/namespace.c:3433 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433 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: 0033:0x4665d9 RSP: 002b:00007f8723cdb188 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: 00007ffda16bba8f R14: 00007f8723cdb300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1638: #0: ffffffff8b978f80 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 2 locks held by in:imklog/8138: #0: ffff888020cf43f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 #1: ffff8880b9c51b98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:460 [inline] #1: ffff8880b9c51b98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1307 [inline] #1: ffff8880b9c51b98 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1610 [inline] #1: ffff8880b9c51b98 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x233/0x26f0 kernel/sched/core.c:5854 2 locks held by kworker/1:4/8694: #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff888010867d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x1630 kernel/workqueue.c:2247 #1: ffffc90002327db0 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 kernel/workqueue.c:2251 5 locks held by kworker/u4:4/9291: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1638 Comm: khungtaskd Not tainted 5.14.0-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+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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+0xd0a/0xfc0 kernel/hung_task.c:295 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: 4841 Comm: systemd-journal Not tainted 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:in_lock_functions+0x0/0x20 kernel/locking/spinlock.c:397 Code: c7 e0 94 ed 8e e8 e0 e4 5f 00 eb 80 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <31> c0 48 81 ff 18 81 2c 89 72 0c 31 c0 48 81 ff 61 8b 2c 89 0f 92 RSP: 0018:ffffc90001a375c0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffffffff81336a80 RCX: 1ffffffff20446ec RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81336a80 RBP: 0000000000000001 R08: ffffffff8e123976 R09: 0000000000000001 R10: fffff52000346ee2 R11: 0000000000086088 R12: ffffc90001a37700 R13: 0000000000000000 R14: ffffc90001a376b8 R15: 0000000000000001 FS: 00007f483f6778c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f483ca6c020 CR3: 000000001299e000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_lock_parent_ip include/linux/ftrace.h:841 [inline] preempt_latency_start kernel/sched/core.c:5124 [inline] preempt_latency_start kernel/sched/core.c:5121 [inline] preempt_count_add+0x74/0x140 kernel/sched/core.c:5149 unwind_next_frame+0x120/0x1ce0 arch/x86/kernel/unwind_orc.c:428 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x81/0xa0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc mm/slab.c:3323 [inline] kmem_cache_alloc+0x25f/0x540 mm/slab.c:3507 kmem_cache_zalloc include/linux/slab.h:711 [inline] lsm_file_alloc security/security.c:571 [inline] security_file_alloc+0x34/0x170 security/security.c:1514 __alloc_file+0xd8/0x280 fs/file_table.c:106 alloc_empty_file+0x6d/0x170 fs/file_table.c:150 path_openat+0xde/0x27f0 fs/namei.c:3493 do_filp_open+0x1aa/0x400 fs/namei.c:3534 do_sys_openat2+0x16d/0x420 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_open fs/open.c:1228 [inline] __se_sys_open fs/open.c:1224 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1224 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: 0033:0x7f483ec06840 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:00007ffe4353a8d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffe4353abe0 RCX: 00007f483ec06840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000056225724bb60 RBP: 000000000000000d R08: 000000000000c0c1 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000056225723e060 R14: 00007ffe4353aba0 R15: 000056225724b980