Hello, syzbot found the following issue on: HEAD commit: a430d95c5efa Merge tag 'lsm-pr-20240911' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=118e68a9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=1653f803fffa3848 dashboard link: https://syzkaller.appspot.com/bug?extid=001306cd9c92ce0df23f compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1452dc07980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=158e68a9980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-a430d95c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/66a65abf87c4/vmlinux-a430d95c.xz kernel image: https://storage.googleapis.com/syzbot-assets/09c88015f9aa/bzImage-a430d95c.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/00e0bb849690/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+001306cd9c92ce0df23f@xxxxxxxxxxxxxxxxxxxxxxxxx loop0: detected capacity change from 0 to 256 vfat: Unknown parameter 's' ./file1: Can't lookup blockdev BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 127b0067 P4D 127b0067 PUD 127b1067 PMD 0 Oops: Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5096 Comm: syz-executor418 Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc90002d7f9f8 EFLAGS: 00010293 RAX: ffffffff81cb4ee0 RBX: 0000000000000000 RCX: ffff88801e428000 RDX: 0000000000000000 RSI: ffffea00004bfec0 RDI: 0000000000000000 RBP: ffffc90002d7fac0 R08: ffffea00004bfec7 R09: 1ffffd4000097fd8 R10: dffffc0000000000 R11: 0000000000000000 R12: ffffea00004bfec0 R13: 1ffffd4000097fd9 R14: 0000000000000000 R15: ffffea00004bfec8 FS: 000055558992f380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000011be2000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> filemap_read_folio+0x1a0/0x790 mm/filemap.c:2355 do_read_cache_folio+0x134/0x820 mm/filemap.c:3796 read_mapping_folio include/linux/pagemap.h:915 [inline] erofs_bread+0x499/0xd40 fs/erofs/data.c:41 erofs_read_superblock fs/erofs/super.c:277 [inline] erofs_fc_fill_super+0x345/0x1770 fs/erofs/super.c:621 vfs_get_super fs/super.c:1280 [inline] get_tree_nodev+0xb7/0x140 fs/super.c:1299 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb0eb9a7f59 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffff42b6ec8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 6d616e74726f6873 RCX: 00007fb0eb9a7f59 RDX: 00000000200005c0 RSI: 0000000020000580 RDI: 0000000020000540 RBP: 0031656c69662f2e R08: 0000000000000000 R09: 00005555899304c0 R10: 0000000000200000 R11: 0000000000000246 R12: 74616c785f696e75 R13: 746e6e69773d656d R14: 646578696d3d656d R15: 00007fb0eb9f103b </TASK> Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc90002d7f9f8 EFLAGS: 00010293 RAX: ffffffff81cb4ee0 RBX: 0000000000000000 RCX: ffff88801e428000 RDX: 0000000000000000 RSI: ffffea00004bfec0 RDI: 0000000000000000 RBP: ffffc90002d7fac0 R08: ffffea00004bfec7 R09: 1ffffd4000097fd8 R10: dffffc0000000000 R11: 0000000000000000 R12: ffffea00004bfec0 R13: 1ffffd4000097fd9 R14: 0000000000000000 R15: ffffea00004bfec8 FS: 000055558992f380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000011be2000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. 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