FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) INFO: task syz-executor.2:7407 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29848 7407 7996 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 __rwsem_down_write_failed_common syzkaller/managers/linux-4-14/kernel/kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x343/0x6d0 syzkaller/managers/linux-4-14/kernel/kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 syzkaller/managers/linux-4-14/kernel/arch/x86/lib/rwsem.S:105 __down_write syzkaller/managers/linux-4-14/kernel/./arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 syzkaller/managers/linux-4-14/kernel/kernel/locking/rwsem.c:56 grab_super+0x55/0x140 syzkaller/managers/linux-4-14/kernel/fs/super.c:373 sget_userns+0x2b1/0xc10 syzkaller/managers/linux-4-14/kernel/fs/super.c:504 sget+0xd1/0x110 syzkaller/managers/linux-4-14/kernel/fs/super.c:572 mount_bdev+0xcd/0x360 syzkaller/managers/linux-4-14/kernel/fs/super.c:1107 mount_fs+0x92/0x2a0 syzkaller/managers/linux-4-14/kernel/fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1046 vfs_kern_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1036 [inline] do_new_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2879 SYSC_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f85b6234188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c158 RCX: 0000000000465b09 RDX: 0000000020001380 RSI: 0000000020001340 RDI: 0000000020001300 RBP: 00000000004b069f R08: 00000000200013c0 R09: 0000000000000000 R10: 0000000002000000 R11: 0000000000000246 R12: 000000000056c158 R13: 00007fff5dd614cf R14: 00007f85b6234300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1524: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:4548 2 locks held by syz-executor.2/7407: #0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [] mount_bdev+0x71/0x360 syzkaller/managers/linux-4-14/kernel/fs/super.c:1101 #1: (&type->s_umount_key#93){+.+.}, at: [] grab_super+0x55/0x140 syzkaller/managers/linux-4-14/kernel/fs/super.c:373 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1524 Comm: khungtaskd Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace syzkaller/managers/linux-4-14/kernel/./include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:274 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4615 Comm: systemd-journal Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a144e600 task.stack: ffff8880a1450000 RIP: 0010:__lockdep_init_map+0x108/0x560 syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:3264 RSP: 0018:ffff8880a1457ac8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffffff8beb4d40 RCX: 0000000000000000 RDX: 1ffff11013c00e46 RSI: ffffffff87c7f3e0 RDI: ffffffff8bf929a0 RBP: ffff88809e007218 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880a144e600 R12: ffffffff8bf929a0 R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a1457e88 FS: 00007f24eeb498c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f24ec197018 CR3: 00000000a1b37000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_init+0x28/0x100 syzkaller/managers/linux-4-14/kernel/kernel/locking/spinlock_debug.c:24 aa_alloc_file_ctx syzkaller/managers/linux-4-14/kernel/security/apparmor/include/file.h:62 [inline] apparmor_file_alloc_security+0x150/0x800 syzkaller/managers/linux-4-14/kernel/security/apparmor/lsm.c:431 security_file_alloc+0x66/0xa0 syzkaller/managers/linux-4-14/kernel/security/security.c:874 get_empty_filp+0x15c/0x3e0 syzkaller/managers/linux-4-14/kernel/fs/file_table.c:129 path_openat+0x84/0x2970 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3545 do_filp_open+0x179/0x3c0 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3603 do_sys_open+0x296/0x410 syzkaller/managers/linux-4-14/kernel/fs/open.c:1081 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f24ee0d9840 RSP: 002b:00007ffea0187318 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffea0187620 RCX: 00007f24ee0d9840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005569a1ed4040 RBP: 000000000000000d R08: 000000000000c0ff R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 00005569a1ec6040 R14: 00007ffea01875e0 R15: 00005569a1ed3410 Code: 48 c1 ea 03 80 3c 02 00 0f 85 f6 03 00 00 4d 85 e4 48 89 75 18 0f 84 f6 02 00 00 4c 89 e7 e8 90 eb ff ff 85 c0 0f 84 57 ce bd 05 <48> b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00