INFO: task syz-executor.0:10857 blocked for more than 143 seconds. Not tainted 5.13.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26320 pid:10857 ppid: 8441 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0xb98/0x1120 kernel/sched/core.c:5147 schedule+0x14b/0x200 kernel/sched/core.c:5226 schedule_timeout+0x98/0x2c0 kernel/time/timer.c:1868 do_wait_for_common+0x2dd/0x450 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_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f3f19700188 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: 00007ffe7d52bd5f R14: 00007f3f19700300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1629: #0: ffffffff8cf15c80 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 2 locks held by kworker/1:2/3227: #0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc90002f27d20 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 1 lock held by in:imklog/8109: #0: ffff888020baf4f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 3 locks held by kworker/u4:1/10858: #0: ffff8880b9b35118 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1334 [inline] #0: ffff8880b9b35118 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x144/0x1120 kernel/sched/core.c:5061 #1: ffffc9000b33fd20 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffff8880b9b24058 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x12a/0x270 kernel/time/timer.c:944 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1629 Comm: khungtaskd Not tainted 5.13.0-rc4-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+0x202/0x31e lib/dump_stack.c:120 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+0xcfb/0xd40 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4843 Comm: systemd-journal Not tainted 5.13.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:50 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:173 [inline] RIP: 0010:unwind_next_frame+0x4e4/0x1f90 arch/x86/kernel/unwind_orc.c:443 Code: 84 5d 13 00 00 e9 7b 13 00 00 4c 89 f5 4d 89 f7 66 0f 1f 44 00 00 4c 89 e8 4c 29 f8 48 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 <48> 83 e0 fe 49 8d 1c 47 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 RSP: 0018:ffffc900012ff380 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff8e4cad54 RCX: 0000000000000000 RDX: ffffffff8eb79aac RSI: ffffffff81c6ef06 RDI: ffffffff8137be89 RBP: ffffffff8e4cad50 R08: 0000000000000008 R09: ffffc900012ff510 R10: fffff5200025fe94 R11: 0000000000000000 R12: ffffffff81c6ef05 R13: ffffffff8e4cad50 R14: ffffffff8e4cad50 R15: ffffffff8e4cad50 FS: 00007f004ee558c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f004c237018 CR3: 0000000015dff000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0xb2/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x104/0x1e0 kernel/stacktrace.c:121 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:428 [inline] __kasan_slab_alloc+0x96/0xd0 mm/kasan/common.c:461 kasan_slab_alloc include/linux/kasan.h:236 [inline] slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2921 [inline] kmem_cache_alloc+0x1d7/0x340 mm/slub.c:2926 kmem_cache_zalloc include/linux/slab.h:676 [inline] __alloc_file+0x26/0x2f0 fs/file_table.c:101 alloc_empty_file+0xa9/0x1b0 fs/file_table.c:150 path_openat+0x119/0x39b0 fs/namei.c:3480 do_filp_open+0x221/0x460 fs/namei.c:3521 do_sys_openat2+0x124/0x460 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_open fs/open.c:1211 [inline] __se_sys_open fs/open.c:1207 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1207 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f004e3e4840 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:00007ffc0e2fa0e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc0e2fa3f0 RCX: 00007f004e3e4840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000056033f1fb210 RBP: 000000000000000d R08: 00007f004e3cebb8 R09: 00000000ffffffff R10: 0000000000000090 R11: 0000000000000246 R12: 00000000ffffffff R13: 000056033f1ef040 R14: 00007ffc0e2fa3b0 R15: 000056033f1fc6b0