INFO: task syz-executor.2:13770 can't die for more than 143 seconds. syz-executor.2 D27528 13770 7316 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 p9_client_rpc+0x3b7/0x12a0 net/9p/client.c:757 p9_client_flush+0xe9/0x1e0 net/9p/client.c:665 p9_client_rpc+0x112f/0x12a0 net/9p/client.c:782 p9_client_version net/9p/client.c:953 [inline] p9_client_create+0xb8e/0x1440 net/9p/client.c:1053 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x970 fs/9p/vfs_super.c:124 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2813 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3138 __do_sys_mount fs/namespace.c:3347 [inline] __se_sys_mount fs/namespace.c:3324 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3324 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007fe08e497c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f62c0 RCX: 000000000045ca29 RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 000000000078bfa0 R08: 0000000020000380 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000752 R14: 00000000004ca315 R15: 00007fe08e4986d4 Showing all locks held in the system: 1 lock held by khungtaskd/1167: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by in:imklog/6770: #0: ffff8880a22fd930 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1167 Comm: khungtaskd Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xde3/0x14e0 kernel/hung_task.c:333 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7070 Comm: syz-fuzzer Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:3661 [inline] RIP: 0010:lockdep_hardirqs_on+0x234/0x620 kernel/locking/lockdep.c:3702 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 23 03 00 00 8b 83 6c 08 00 00 <48> 8d bb 88 08 00 00 48 89 fa 48 c1 ea 03 8d 68 01 48 b8 00 00 00 RSP: 0018:ffffc90001157878 EFLAGS: 00000046 RAX: 00000000003944ce RBX: ffff8880a912a080 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8880a912a8ec RBP: ffffffff87d699af R08: ffff8880a912a080 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae6379c0 R13: ffff8880904d80c0 R14: ffff88809e43a2c0 R15: 0000000000000402 FS: 0000000001693010(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb6e89c3000 CR3: 00000000a2b04000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199 finish_lock_switch kernel/sched/core.c:3111 [inline] finish_task_switch+0x147/0x750 kernel/sched/core.c:3211 context_switch kernel/sched/core.c:3375 [inline] __schedule+0x93f/0x1ff0 kernel/sched/core.c:4088 schedule+0xd0/0x2a0 kernel/sched/core.c:4163 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue_me+0x2a7/0x570 kernel/futex.c:2631 futex_wait+0x1e2/0x550 kernel/futex.c:2737 do_futex+0x15f/0x1ad0 kernel/futex.c:3808 __do_sys_futex kernel/futex.c:3869 [inline] __se_sys_futex kernel/futex.c:3837 [inline] __x64_sys_futex+0x376/0x4f0 kernel/futex.c:3837 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x460c23 Code: 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 4c 8b 54 24 18 4c 8b 44 24 20 44 8b 4c 24 28 b8 ca 00 00 00 0f 05 <89> 44 24 30 c3 cc cc cc cc cc cc cc cc 8b 7c 24 08 48 8b 74 24 10 RSP: 002b:000000c00003f6a0 EFLAGS: 00000206 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000003b975ae2 RCX: 0000000000460c23 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000001696560 RBP: 000000c00003f6e8 R08: 0000000000000000 R09: 0000000000000000 R10: 000000c00003f6d8 R11: 0000000000000206 R12: 0000008672c5e99b R13: 0000000000000001 R14: 0000008672c5e99b R15: 0000000000000042