INFO: task syz-executor5:29207 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #29 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D61144 29207 4615 0x00000004 Call Trace: context_switch kernel/sched/core.c:2857 [inline] __schedule+0x652/0x780 kernel/sched/core.c:3507 schedule kernel/sched/core.c:3551 [inline] schedule_preempt_disabled+0x1cc/0x300 kernel/sched/core.c:3609 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xba4/0x1b60 kernel/locking/mutex.c:894 __mutex_lock_slowpath+0x2c/0x30 kernel/locking/mutex.c:1155 mutex_lock+0xc2/0x110 kernel/locking/mutex.c:242 fuse_lock_inode+0x9e/0xe0 fs/fuse/inode.c:363 fuse_lookup+0xcb/0x810 fs/fuse/dir.c:359 __lookup_slow+0x59d/0x770 fs/namei.c:1630 lookup_slow fs/namei.c:1647 [inline] walk_component+0x35c/0xbf0 fs/namei.c:1769 lookup_last fs/namei.c:2237 [inline] path_lookupat+0x3c4/0x1180 fs/namei.c:2287 filename_lookup+0x308/0xc00 fs/namei.c:2321 user_path_at_empty+0x123/0x140 fs/namei.c:2584 user_path include/linux/namei.h:62 [inline] do_mount+0x2c1/0x5310 fs/namespace.c:2788 ksys_mount+0x32e/0x3d0 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0x157/0x1c0 fs/namespace.c:3075 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007f83ccfe5c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f83ccfe66d4 RCX: 0000000000455ab9 RDX: 00000000200001c0 RSI: 0000000020000140 RDI: 0000000020000100 RBP: 000000000072bf48 R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000304800 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0268 R14: 00000000004cff10 R15: 0000000000000001 INFO: task syz-executor5:29212 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #29 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D61144 29212 4615 0x00000004 Call Trace: context_switch kernel/sched/core.c:2857 [inline] __schedule+0x652/0x780 kernel/sched/core.c:3507 schedule+0x1cc/0x300 kernel/sched/core.c:3551 d_wait_lookup fs/dcache.c:2455 [inline] d_alloc_parallel+0x1426/0x2470 fs/dcache.c:2537 __lookup_slow+0x190/0x770 fs/namei.c:1613 lookup_slow fs/namei.c:1647 [inline] walk_component+0x35c/0xbf0 fs/namei.c:1769 lookup_last fs/namei.c:2237 [inline] path_lookupat+0x3c4/0x1180 fs/namei.c:2287 filename_lookup+0x308/0xc00 fs/namei.c:2321 user_path_at_empty+0x123/0x140 fs/namei.c:2584 user_path include/linux/namei.h:62 [inline] do_mount+0x2c1/0x5310 fs/namespace.c:2788 ksys_mount+0x32e/0x3d0 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0x157/0x1c0 fs/namespace.c:3075 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007f83ccf82c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f83ccf836d4 RCX: 0000000000455ab9 RDX: 00000000200001c0 RSI: 0000000020000140 RDI: 0000000020000100 RBP: 000000000072c140 R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000304800 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0268 R14: 00000000004cff10 R15: 0000000000000004 NMI backtrace for cpu 1 CPU: 1 PID: 808 Comm: khungtaskd Not tainted 4.18.0-rc5+ #29 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+0x185/0x1e0 lib/dump_stack.c:113 nmi_cpu_backtrace lib/nmi_backtrace.c:103 [inline] nmi_trigger_cpumask_backtrace+0x26f/0x4e0 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x2c/0x40 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x2b/0x30 include/linux/nmi.h:138 check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x1107/0x1130 kernel/hung_task.c:252 kthread+0x473/0x4b0 kernel/kthread.c:247 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: ------------[ cut here ]------------ kernel BUG at mm/kmsan/kmsan_entry.c:81! invalid opcode: 0000 [#1] SMP PTI CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.18.0-rc5+ #29 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kmsan_nmi_enter+0x42/0x70 mm/kmsan/kmsan_entry.c:80 Code: 00 74 27 65 8b 04 25 80 90 03 00 83 c0 01 83 f8 08 7d 27 65 89 04 25 80 90 03 00 65 c6 04 25 15 6e 0b 00 ff c3 0f 0b 90 eb fe <0f> 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 eb fe 0f 0b 66 90 66 2e RSP: 0018:fffffe000000eea8 EFLAGS: 00010046 RAX: 0000000080000000 RBX: 0000000000000001 RCX: 00000000c0000101 RDX: 00000000ffff8802 RSI: ffffffff8a40136c RDI: ffffea0000439620 RBP: fffffe000000eef9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 00000001a9152000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001a9152000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace 41c04f7ec7c4fbd8 ]--- RIP: 0010:kmsan_nmi_enter+0x42/0x70 mm/kmsan/kmsan_entry.c:80 Code: 00 74 27 65 8b 04 25 80 90 03 00 83 c0 01 83 f8 08 7d 27 65 89 04 25 80 90 03 00 65 c6 04 25 15 6e 0b 00 ff c3 0f 0b 90 eb fe <0f> 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 eb fe 0f 0b 66 90 66 2e RSP: 0018:fffffe000000eea8 EFLAGS: 00010046 RAX: 0000000080000000 RBX: 0000000000000001 RCX: 00000000c0000101 RDX: 00000000ffff8802 RSI: ffffffff8a40136c RDI: ffffea0000439620 RBP: fffffe000000eef9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 00000001a9152000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001a9152000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600