FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) INFO: task syz-executor.5:19965 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 ISO 9660 Extensions: Microsoft Joliet Level 3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) syz-executor.5 D28424 19965 8122 0x00000004 FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 request_wait_answer+0x3dc/0x750 fs/fuse/dev.c:485 __fuse_request_send+0x123/0x1c0 fs/fuse/dev.c:505 fuse_simple_request+0x2e6/0x820 fs/fuse/dev.c:576 fuse_dentry_revalidate+0x477/0x9f0 fs/fuse/dir.c:219 d_revalidate fs/namei.c:767 [inline] lookup_fast+0xe0e/0x1080 fs/namei.c:1616 walk_component+0xde/0xda0 fs/namei.c:1807 lookup_last fs/namei.c:2274 [inline] path_lookupat+0x1ff/0x8d0 fs/namei.c:2319 do_o_path fs/namei.c:3511 [inline] path_openat+0x1f92/0x2df0 fs/namei.c:3533 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff9d6536279 Code: Bad RIP value. RSP: 002b:00007ff9d4e69168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ff9d6649120 RCX: 00007ff9d6536279 RDX: 00000000000000e8 RSI: 0000000000200101 RDI: 0000000020000000 RBP: 00007ff9d6590189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffb8c55c2f R14: 00007ff9d4e69300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) #0: 00000000cda7c9fe (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7804: #0: 000000000416fbf7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by rs:main Q:Reg/7806: 2 locks held by syz-executor.0/8121: #0: 00000000dbaeeb33 (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xfc/0x870 fs/block_dev.c:1806 #1: 00000000adcb0e67 (loop_ctl_mutex){+.+.}, at: lo_release+0x1a/0x1f0 drivers/block/loop.c:1790 1 lock held by syz-executor.3/8123: #0: 0000000070aa4349 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 2 locks held by syz-executor.2/8124: #0: 00000000776c2330 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 #1: 00000000adcb0e67 (loop_ctl_mutex){+.+.}, at: lo_open+0x19/0xd0 drivers/block/loop.c:1771 2 locks held by syz-executor.1/8128: #0: 00000000251113b3 (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xfc/0x870 fs/block_dev.c:1806 #1: 00000000adcb0e67 (loop_ctl_mutex){+.+.}, at: __loop_clr_fd+0x777/0xe50 drivers/block/loop.c:1164 2 locks held by kworker/u4:9/21605: #0: 0000000094946009 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 0000000094946009 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000cda7c9fe (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000cda7c9fe (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 1 lock held by systemd-udevd/20579: ISO 9660 Extensions: Microsoft Joliet Level 3 #0: 0000000094946009 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 0000000094946009 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4691 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:91 [inline] RIP: 0010:rcu_read_unlock_sched_notrace include/linux/rcupdate.h:771 [inline] RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline] RIP: 0010:lock_acquire+0x2f4/0x3c0 kernel/locking/lockdep.c:3907 Code: e8 c3 e7 b4 ff e9 4b fe ff ff 65 ff 05 d5 89 b6 7e 48 8b 05 06 86 c3 09 e8 69 48 05 00 85 c0 74 09 80 3d a1 35 c3 09 00 74 3f <65> ff 0d b5 89 b6 7e 0f 85 3e fe ff ff e8 8c e7 b4 ff e9 34 fe ff RSP: 0018:ffff8880a0c1fc20 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880a0c16540 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffff8880a0c16dc4 RBP: ffffffff8d397de0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fb85ae1f8c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb8574cd000 CR3: 00000000a1162000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:152 __debug_object_init+0xb9/0x9b0 lib/debugobjects.c:383 debug_object_init lib/debugobjects.c:431 [inline] debug_object_activate+0x382/0x450 lib/debugobjects.c:512 debug_rcu_head_queue kernel/rcu/rcu.h:193 [inline] __call_rcu.constprop.0+0x31/0x7f0 kernel/rcu/tree.c:2977 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb85a3ae840 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:00007ffda6768238 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007ffda6768540 RCX: 00007fb85a3ae840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000563cc101b760 RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000563cc1017040 R14: 00007ffda6768500 R15: 0000563cc10249f0