FAT-fs (loop3): Unrecognized mount option "euid<00000000000000000000" or missing value INFO: task syz-executor.0:23394 blocked for more than 140 seconds. Not tainted 4.9.188+ #19 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D25528 23394 1 0x00000004 0000000000000087 ffff8801cb515f00 ffff8801a37bbc80 ffff8801db721000 ffff8801a23c17c0 ffff8801db721018 ffff8801a2227598 ffffffff8281749e ffffffff82e2e6d8 ffffffff8120bd30 00ffffff83c84a40 ffff8801db7218f0 Call Trace: [<0000000046b7037b>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000b5bd5e62>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000004e000dda>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000004e000dda>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000ffe6a04c>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 [<00000000d74b2849>] fuse_lookup+0x89/0x3b0 fs/fuse/dir.c:406 [<000000000ed716d1>] lookup_slow+0x24b/0x480 fs/namei.c:1709 [<0000000021fea3da>] walk_component+0x71e/0xce0 fs/namei.c:1825 [<0000000059b2f81a>] link_path_walk+0x8b4/0x1210 fs/namei.c:2161 [<000000009f759181>] path_mountpoint+0x67/0x6d0 fs/namei.c:2737 [<00000000cc674c2d>] filename_mountpoint+0x17f/0x350 fs/namei.c:2758 [<00000000a8554df9>] user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2788 [<00000000ec7ebd23>] SYSC_umount fs/namespace.c:1722 [inline] [<00000000ec7ebd23>] SyS_umount+0x136/0xd30 fs/namespace.c:1706 [<0000000029bb3c88>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000e9de427e>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<00000000397be752>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000397be752>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<0000000050f9a0f8>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 3 locks held by rs:main Q:Reg/1902: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000f620d376>] __fdget_pos+0xa8/0xd0 fs/file.c:782 #1: (sb_writers#4){.+.+.+}, at: [<00000000ac826938>] file_start_write include/linux/fs.h:2646 [inline] #1: (sb_writers#4){.+.+.+}, at: [<00000000ac826938>] vfs_write+0x3e9/0x520 fs/read_write.c:558 #2: (&sb->s_type->i_mutex_key#9){++++++}, at: [<0000000097498754>] inode_lock include/linux/fs.h:771 [inline] #2: (&sb->s_type->i_mutex_key#9){++++++}, at: [<0000000097498754>] __generic_file_fsync+0xcd/0x1c0 fs/libfs.c:978 1 lock held by rsyslogd/1905: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000f620d376>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2032: #0: (&tty->ldisc_sem){++++++}, at: [<000000004e1df25c>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000ab331762>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.0/23394: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<00000000331f6199>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<00000000331f6199>] lookup_slow+0x160/0x480 fs/namei.c:1686 #1: (&fi->mutex){+.+.+.}, at: [<00000000ffe6a04c>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 2 locks held by syz-executor.0/2025: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<00000000331f6199>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<00000000331f6199>] lookup_slow+0x160/0x480 fs/namei.c:1686 #1: (&fi->mutex){+.+.+.}, at: [<00000000ffe6a04c>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.188+ #19 ffff8801d98d7cc8 ffffffff81b64a21 0000000000000001 0000000000000000 0000000000000001 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b6fcbc 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000bb182da7>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000bb182da7>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000177c4aa4>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000003777459e>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000018f13b29>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000004e49951e>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000004e49951e>] check_hung_task kernel/hung_task.c:126 [inline] [<000000004e49951e>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000004e49951e>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000000d49266e>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000001f17d86e>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1902 Comm: rs:main Q:Reg Not tainted 4.9.188+ #19 task: 00000000c218a1e5 task.stack: 000000007085e8d4 RIP: 0010:[] c [<000000001a22266c>] generic_make_request_checks+0x0/0x1190 block/blk-core.c:1882 RSP: 0018:ffff8801d614f628 EFLAGS: 00000293 RAX: ffff8801d3dac740 RBX: dffffc0000000000 RCX: 1ffffffff08447fc RDX: 0000000000000000 RSI: ffffffff81af8676 RDI: ffff8801c7a27e00 RBP: ffff8801d614f710 R08: ffff8801cbaa6020 R09: ffff8801c7a27e00 R10: ffffed0038f44fcd R11: ffff8801c7a27e6f R12: ffff8801c7a27e00 R13: ffff8801c7a27e00 R14: ffff8801c7a27e18 R15: 0000000000000001 FS: 00007f70b47e5700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000158c3e0 CR3: 00000001d4881000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffffffff81af867ec ffff8801d3dac740c 0241120000400000c 1ffff1003ac29eccc 1ffff1003b38c4a9c ffffed003b38c4aac 0000000041b58ab3c 0000000041b58ab3c ffffffff82e575d8c ffffffff81af8600c ffff8801d3dac740c 0000000000000000c Call Trace: [<000000001acc47d3>] submit_bio+0xb0/0x420 block/blk-core.c:2123 [<00000000d3464ece>] submit_bh_wbc.isra.0+0x3a3/0x590 fs/buffer.c:3109 [<00000000e714b291>] submit_bh fs/buffer.c:3122 [inline] [<00000000e714b291>] __sync_dirty_buffer+0xcc/0x1e0 fs/buffer.c:3208 [<00000000eeeda6a3>] sync_dirty_buffer+0x1b/0x20 fs/buffer.c:3221 [<00000000baa6b22c>] ext4_write_inode+0x36c/0x3d0 fs/ext4/inode.c:5094 [<000000008fd8ae12>] write_inode fs/fs-writeback.c:1224 [inline] [<000000008fd8ae12>] __writeback_single_inode+0x4cf/0x1040 fs/fs-writeback.c:1423 [<00000000f602c2a0>] writeback_single_inode+0x256/0x450 fs/fs-writeback.c:1477 [<00000000438a86b9>] sync_inode fs/fs-writeback.c:2505 [inline] [<00000000438a86b9>] sync_inode_metadata+0xc3/0x100 fs/fs-writeback.c:2525 [<0000000036ac6c0a>] __generic_file_fsync+0x14c/0x1c0 fs/libfs.c:985 [<0000000076263145>] ext4_sync_file+0x656/0x1090 fs/ext4/fsync.c:116 [<0000000011885f31>] vfs_fsync_range+0x111/0x260 fs/sync.c:195 [<00000000309ba42a>] generic_write_sync include/linux/fs.h:2613 [inline] [<00000000309ba42a>] ext4_file_write_iter+0x8b5/0xcd0 fs/ext4/file.c:176 [<00000000a74d841b>] new_sync_write fs/read_write.c:498 [inline] [<00000000a74d841b>] __vfs_write+0x3c1/0x560 fs/read_write.c:511 [<0000000029950000>] vfs_write+0x185/0x520 fs/read_write.c:559 [<0000000068727d80>] SYSC_write fs/read_write.c:607 [inline] [<0000000068727d80>] SyS_write+0x121/0x270 fs/read_write.c:599 [<0000000029bb3c88>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000e9de427e>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c89 cdf ce8 c14 cb9 ca0 cff ce9 c48 cff cff cff ce8 c0a cb9 ca0 cff ce9 c19 cff cff cff c4c c89 cf7 ce8 cfd cb8 ca0 cff ce9 ce4 cfe cff cff c0f c1f c84 c00 c00 c00 c00 c00 c<55> c48 c89 ce5 c41 c57 c48 c8d c85 c58 cff cff cff c41 c56 c48 cc1 ce8 c03 c41 c55 c