attempt to access beyond end of device FAT-fs (loop0): Can't find a valid FAT filesystem loop3: rw=2049, want=74, limit=60 ttyprintk ttyprintk: tty_port_close_start: tty->count = 1 port count = 3 ====================================================== WARNING: possible circular locking dependency detected 4.14.194-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/19065 is trying to acquire lock: (console_owner){-.-.}, at: [] console_trylock_spinning kernel/printk/printk.c:1658 [inline] (console_owner){-.-.}, at: [] vprintk_emit+0x32a/0x620 kernel/printk/printk.c:1922 but task is already holding lock: (&(&port->lock)->rlock){-.-.}, at: [] tty_port_close_start.part.0+0x28/0x4c0 drivers/tty/tty_port.c:573 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&(&port->lock)->rlock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160 tty_port_tty_get+0x1d/0x80 drivers/tty/tty_port.c:288 tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:46 serial8250_tx_chars+0x3fe/0xbf0 drivers/tty/serial/8250/8250_port.c:1810 serial8250_handle_irq.part.0+0x1f8/0x240 drivers/tty/serial/8250/8250_port.c:1883 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1869 [inline] serial8250_default_handle_irq+0x8a/0x1f0 drivers/tty/serial/8250/8250_port.c:1899 serial8250_interrupt+0xe4/0x1a0 drivers/tty/serial/8250/8250_core.c:129 __handle_irq_event_percpu+0xee/0x7f0 kernel/irq/handle.c:147 handle_irq_event_percpu kernel/irq/handle.c:187 [inline] handle_irq_event+0xf0/0x246 kernel/irq/handle.c:204 handle_edge_irq+0x224/0xc40 kernel/irq/chip.c:770 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x35/0x50 arch/x86/kernel/irq_64.c:87 do_IRQ+0x93/0x1d0 arch/x86/kernel/irq.c:230 ret_from_intr+0x0/0x1e arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:192 spin_unlock_irqrestore include/linux/spinlock.h:372 [inline] uart_write+0x2dd/0x560 drivers/tty/serial/serial_core.c:625 do_output_char+0x4f5/0x750 drivers/tty/n_tty.c:447 process_output drivers/tty/n_tty.c:514 [inline] n_tty_write+0x3e3/0xda0 drivers/tty/n_tty.c:2345 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x410/0x740 drivers/tty/tty_io.c:1043 redirected_tty_write+0x9c/0xb0 drivers/tty/tty_io.c:1064 do_loop_readv_writev fs/read_write.c:698 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_write+0x3da/0x550 fs/read_write.c:956 vfs_writev+0x125/0x290 fs/read_write.c:999 do_writev+0xfc/0x2c0 fs/read_write.c:1034 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (&port_lock_key){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160 serial8250_console_write+0x7a7/0x9d0 drivers/tty/serial/8250/8250_port.c:3236 call_console_drivers kernel/printk/printk.c:1725 [inline] console_unlock+0x99d/0xf20 kernel/printk/printk.c:2397 vprintk_emit+0x224/0x620 kernel/printk/printk.c:1923 vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401 printk+0x9e/0xbc kernel/printk/printk.c:1996 register_console+0x6f4/0xad0 kernel/printk/printk.c:2716 univ8250_console_init+0x2f/0x3a drivers/tty/serial/8250/8250_core.c:691 console_init+0x46/0x53 kernel/printk/printk.c:2797 start_kernel+0x52e/0x770 init/main.c:634 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #0 (console_owner){-.-.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 console_trylock_spinning kernel/printk/printk.c:1679 [inline] vprintk_emit+0x367/0x620 kernel/printk/printk.c:1922 vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401 printk+0x9e/0xbc kernel/printk/printk.c:1996 tty_port_close_start.part.0+0x46c/0x4c0 drivers/tty/tty_port.c:575 tty_port_close_start drivers/tty/tty_port.c:647 [inline] tty_port_close+0x3b/0x130 drivers/tty/tty_port.c:640 tty_release+0x402/0xe20 drivers/tty/tty_io.c:1670 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: console_owner --> &port_lock_key --> &(&port->lock)->rlock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&(&port->lock)->rlock); lock(&port_lock_key); lock(&(&port->lock)->rlock); lock(console_owner); *** DEADLOCK *** 2 locks held by syz-executor.2/19065: #0: (&tty->legacy_mutex){+.+.}, at: [] tty_lock+0x5f/0x70 drivers/tty/tty_mutex.c:19 #1: (&(&port->lock)->rlock){-.-.}, at: [] tty_port_close_start.part.0+0x28/0x4c0 drivers/tty/tty_port.c:573 stack backtrace: CPU: 1 PID: 19065 Comm: syz-executor.2 Not tainted 4.14.194-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 console_trylock_spinning kernel/printk/printk.c:1679 [inline] vprintk_emit+0x367/0x620 kernel/printk/printk.c:1922 vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401 printk+0x9e/0xbc kernel/printk/printk.c:1996 tty_port_close_start.part.0+0x46c/0x4c0 drivers/tty/tty_port.c:575 tty_port_close_start drivers/tty/tty_port.c:647 [inline] tty_port_close+0x3b/0x130 drivers/tty/tty_port.c:640 tty_release+0x402/0xe20 drivers/tty/tty_io.c:1670 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d579 RSP: 002b:00007fb36251ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000004 RBX: 0000000000002a00 RCX: 000000000045d579 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000006 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffe54ba736f R14: 00007fb36251f9c0 R15: 000000000118cf4c FAT-fs (loop5): Unrecognized mount option "./bus" or missing value FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) attempt to access beyond end of device FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop5): bogus number of FAT sectors FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop5): Can't find a valid FAT filesystem loop3: rw=2049, want=66, limit=60 attempt to access beyond end of device loop3: rw=2049, want=74, limit=60 FAT-fs (loop5): bogus number of FAT sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) attempt to access beyond end of device FAT-fs (loop2): bogus number of directory entries (17726) loop3: rw=2049, want=66, limit=60 FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop2): Can't find a valid FAT filesystem attempt to access beyond end of device FAT-fs (loop0): Can't find a valid FAT filesystem loop3: rw=0, want=66, limit=60 attempt to access beyond end of device loop3: rw=0, want=66, limit=60 FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop2): Can't find a valid FAT filesystem attempt to access beyond end of device loop3: rw=2049, want=66, limit=60 kauditd_printk_skb: 7 callbacks suppressed audit: type=1804 audit(1598307807.985:386): pid=19170 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir899663287/syzkaller.UexmFn/291/file1/bus" dev="loop3" ino=320 res=1 attempt to access beyond end of device loop3: rw=0, want=66, limit=60 attempt to access beyond end of device loop3: rw=0, want=66, limit=60 FAT-fs (loop0): Unrecognized mount option "I>B#ť$" or missing value FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop2): Can't find a valid FAT filesystem IPVS: set_ctl: invalid protocol: 8 224.0.0.1:20004 attempt to access beyond end of device loop3: rw=2049, want=66, limit=60 FAT-fs (loop0): Unrecognized mount option "2a.ma>]P!&ԶoTĩl`i!TOSD_~u?/oP20{Eb Í/2Izjgd" or missing value audit: type=1804 audit(1598307808.255:387): pid=19206 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir899663287/syzkaller.UexmFn/292/file1/bus" dev="loop3" ino=321 res=1 attempt to access beyond end of device FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop2): Can't find a valid FAT filesystem loop3: rw=0, want=66, limit=60 IPVS: set_ctl: invalid protocol: 8 224.0.0.1:20004 FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop3): Unrecognized mount option "I>B#ť$" or missing value FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop2): Unrecognized mount option "/dev/dlm-control" or missing value FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop2): Unrecognized mount option "veth0_to_hsr" or missing value FAT-fs (loop2): bread failed, FSINFO block (sector = 183) FAT-fs (loop0): Unrecognized mount option "MoKi" or missing value FAT-fs (loop2): bogus number of reserved sectors FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop0): invalid media value (0x61) FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop2): Unrecognized mount option ":6rփf" or missing value FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop2): Unrecognized mount option "eg51I=/xלG~V :EFaC\;pfL9?5;ؠobH { ANJ@ob:@1+" or missing value FAT-fs (loop2): Unrecognized mount option "eg51I=/xלG~V :EFaC\;pfL9?5;ؠobH { ANJ@ob:@1+" or missing value FAT-fs (loop0): Unrecognized mount option "func=CREDS_CHECK" or missing value print_req_error: 10 callbacks suppressed print_req_error: I/O error, dev loop3, sector 0 Unknown ioctl 21378 Unknown ioctl 21378 FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop2): Can't find a valid FAT filesystem print_req_error: I/O error, dev loop5, sector 0 FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop2): Unrecognized mount option "" or missing value print_req_error: I/O error, dev loop3, sector 0 print_req_error: I/O error, dev loop5, sector 0 FAT-fs (loop2): Unrecognized mount option " " or missing value FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) print_req_error: I/O error, dev loop5, sector 0 FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop2): Unrecognized mount option "" or missing value print_req_error: I/O error, dev loop3, sector 0 FAT-fs (loop2): Unrecognized mount option "" or missing value FAT-fs (loop0): Unrecognized mount option "smackfstransmute=*" or missing value print_req_error: I/O error, dev loop3, sector 0 print_req_error: I/O error, dev loop5, sector 0 FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop0): Unrecognized mount option "obj_type=*" or missing value FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop2): Unrecognized mount option "" or missing value FAT-fs (loop2): Unrecognized mount option "" or missing value FAT-fs (loop0): Unrecognized mount option "J+D" or missing value FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop2): Unrecognized mount option "BYvHd˦|U#A [7șQx0_M^xc1"m:mkα$" or missing value FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop0): Can't find a valid FAT filesystem print_req_error: I/O error, dev loop3, sector 1 buffer_io_error: 5 callbacks suppressed Buffer I/O error on dev loop3, logical block 1, async page read print_req_error: I/O error, dev loop3, sector 2 Buffer I/O error on dev loop3, logical block 2, async page read Buffer I/O error on dev loop3, logical block 3, async page read Buffer I/O error on dev loop3, logical block 4, async page read Buffer I/O error on dev loop3, logical block 5, async page read Buffer I/O error on dev loop3, logical block 6, async page read Buffer I/O error on dev loop3, logical block 7, async page read FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop0): Unrecognized mount option "" or missing value FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop2): Unrecognized mount option "/dev/vcs#" or missing value FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop2): Unrecognized mount option "00000000000000000004" or missing value FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop2): Unrecognized mount option "" or missing value FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop2): Unrecognized mount option "" or missing value FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop2): Unrecognized mount option "./file1" or missing value FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop0): Unrecognized mount option "hZtsm_w#u%h̪l 1g8Hϲ PH|-& bbƟU" or missing value FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 183) FAT-fs (loop0): Unrecognized mount option "hZtsm_w#u%h̪l 1g8Hϲ PH|-& bbƟU" or missing value FAT-fs (loop2): bogus number of directory entries (17726) FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop0): bogus number of FAT sectors FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop5): Can't find a valid FAT filesystem audit: type=1400 audit(1598307816.146:388): avc: denied { create } for pid=20019 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dccp_socket permissive=1 FAT-fs (loop3): bogus number of reserved sectors Buffer I/O error on dev loop5, logical block 1, async page read Buffer I/O error on dev loop5, logical block 2, async page read Buffer I/O error on dev loop5, logical block 3, async page read FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 171) FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop0): bogus number of directory entries (17726) FAT-fs (loop0): Can't find a valid FAT filesystem