FAT-fs (loop4): unable to read boot sector FAT-fs (loop6): bogus number of reserved sectors FAT-fs (loop6): Can't find a valid FAT filesystem ------------[ cut here ]------------ WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#0: syz-executor.5/23395 Modules linked in: CPU: 0 UID: 0 PID: 23395 Comm: syz-executor.5 Not tainted 6.18.0-rc3-next-20251031 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:get_data+0x364/0x400 Code: e8 83 e0 07 83 c0 03 38 d0 0f 8c be fe ff ff 84 d2 0f 84 b6 fe ff ff 48 89 ef e8 17 b8 5b 00 e9 a9 fe ff ff e8 4d bb 1e 00 90 <0f> 0b 90 45 31 e4 e9 3b ff ff ff e8 3c bb 1e 00 90 0f 0b 90 45 31 RSP: 0018:ffff88803db57340 EFLAGS: 00010212 RAX: 0000000000000e35 RBX: ffff88803db57458 RCX: ffffc90009029000 RDX: 0000000000040000 RSI: ffffffff81555ba3 RDI: 0000000000000006 RBP: ffff88803db57420 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85d30790 R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000 FS: 00007fbdb3e12700(0000) GS:ffff8880e53ed000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbdb3e13000 CR3: 000000000dcf5000 CR4: 0000000000350ef0 Call Trace: _prb_read_valid+0x2f3/0x830 prb_read_valid+0x78/0xa0 printk_get_next_message+0x10b/0x570 console_flush_one_record+0x64f/0xb20 __console_flush_and_unlock+0xb1/0x1d0 vprintk_emit+0x4c1/0x690 _printk+0xbe/0xf0 logfc+0x46f/0x6e0 vfs_parse_fs_param+0x300/0x3d0 vfs_parse_fs_qstr+0x138/0x1c0 vfs_parse_monolithic_sep+0x198/0x220 path_mount+0x6d0/0x2130 __x64_sys_mount+0x293/0x310 do_syscall_64+0xbf/0x390 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbdb689e04a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbdb3e11fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020001840 RCX: 00007fbdb689e04a RDX: 0000000020000280 RSI: 00000000200002c0 RDI: 00007fbdb3e12000 RBP: 00007fbdb3e12040 R08: 00007fbdb3e12040 R09: 0000000020000280 R10: 0000000003010400 R11: 0000000000000206 R12: 0000000020000280 R13: 00000000200002c0 R14: 00007fbdb3e12000 R15: 0000000020001940 irq event stamp: 2633 hardirqs last enabled at (2639): [] vprintk_emit+0x650/0x690 hardirqs last disabled at (2644): [] vprintk_emit+0x5e1/0x690 softirqs last enabled at (2296): [] handle_softirqs+0x50c/0x770 softirqs last disabled at (2287): [] __irq_exit_rcu+0xc4/0x100 ---[ end trace 0000000000000000 ]--- loop7: detected capacity change from 0 to 264192 loop1: detected capacity change from 0 to 264192 loop6: detected capacity change from 0 to 264192 loop5: detected capacity change from 0 to 264192 FAT-fs (loop4): unable to read boot sector FAT-fs (loop6): bogus number of reserved sectors FAT-fs (loop6): Can't find a valid FAT filesystem msdos: Unknown parameter 'obj_role' loop2: detected capacity change from 0 to 264192 FAT-fs (loop2): bogus number of reserved sectors FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop3): unable to read boot sector loop0: detected capacity change from 0 to 264192 msdos: Unknown parameter 'obj_role' loop1: detected capacity change from 0 to 264192 msdos: Unknown parameter 'obj_role' FAT-fs (loop1): unable to read boot sector loop0: detected capacity change from 0 to 264192 msdos: Unknown parameter 'obj_role' loop2: detected capacity change from 0 to 264192 loop4: detected capacity change from 0 to 264192 loop6: detected capacity change from 0 to 264192 loop7: detected capacity change from 0 to 264192 FAT-fs (loop3): unable to read boot sector FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem FAT-fs (loop6): bogus number of reserved sectors FAT-fs (loop6): Can't find a valid FAT filesystem loop5: detected capacity change from 0 to 264192 msdos: Unknown parameter 'obj_role' FAT-fs (loop2): bogus number of reserved sectors FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop1): unable to read boot sector FAT-fs (loop1): unable to read boot sector loop0: detected capacity change from 0 to 264192 msdos: Unknown parameter 'obj_role' loop4: detected capacity change from 0 to 264192 loop7: detected capacity change from 0 to 264192 FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem loop3: detected capacity change from 0 to 264192 loop5: detected capacity change from 0 to 264192 loop6: detected capacity change from 0 to 264192 msdos: Unknown parameter 'obj_role' loop2: detected capacity change from 0 to 264192 FAT-fs (loop3): invalid media value (0x71) FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop6): invalid media value (0x71) FAT-fs (loop6): Can't find a valid FAT filesystem FAT-fs (loop2): bogus number of reserved sectors FAT-fs (loop2): Can't find a valid FAT filesystem loop4: detected capacity change from 0 to 264192 loop0: detected capacity change from 0 to 264192 FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem msdos: Unknown parameter 'obj_role' No source specified loop2: detected capacity change from 0 to 264192 FAT-fs (loop2): bogus number of reserved sectors FAT-fs (loop3): unable to read boot sector FAT-fs (loop2): Can't find a valid FAT filesystem