syzbot


kernel BUG in fat_get_block

Status: upstream: reported C repro on 2022/11/26 06:21
Subsystems: fat
[Documentation on labels]
Reported-by: syzbot+82fe408cc2ae86b43c0e@syzkaller.appspotmail.com
First crash: 566d, last: 488d
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2023/02/11 20:13 25m bisect fix linux-4.14.y job log (0) log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/fat/inode.c:161!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7987 Comm: syz-executor366 Not tainted 4.14.300-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
task: ffff8880a5ab6000 task.stack: ffff8880b3ff0000
RIP: 0010:__fat_get_block fs/fat/inode.c:161 [inline]
RIP: 0010:fat_get_block+0x647/0x750 fs/fat/inode.c:176
RSP: 0018:ffff8880b3ff76d8 EFLAGS: 00010297
RAX: ffff8880a5ab6000 RBX: ffff88808df1ae70 RCX: ffff8880b3ff7750
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88808df19ae8
RBP: ffff88808df19ba0 R08: ffff8880b3ff7770 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880a5ab6000 R12: ffff888095a9ccc0
R13: 0000000000000000 R14: 000000000000000b R15: 0000000000000001
FS:  0000555556497300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f333ddc05a0 CR3: 000000009991e000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __block_write_begin_int+0x35c/0x11d0 fs/buffer.c:2038
 __block_write_begin fs/buffer.c:2088 [inline]
 block_write_begin+0x58/0x270 fs/buffer.c:2147
 cont_write_begin+0x4a3/0x740 fs/buffer.c:2497
 fat_write_begin+0x89/0x170 fs/fat/inode.c:222
 cont_expand_zero fs/buffer.c:2424 [inline]
 cont_write_begin+0x296/0x740 fs/buffer.c:2487
 fat_write_begin+0x89/0x170 fs/fat/inode.c:222
 generic_cont_expand_simple+0xe1/0x130 fs/buffer.c:2388
 fat_cont_expand+0x71/0x280 fs/fat/file.c:198
 fat_setattr+0x8b8/0xbe0 fs/fat/file.c:477
 notify_change+0x56b/0xd10 fs/attr.c:315
 do_truncate+0xff/0x1a0 fs/open.c:63
 vfs_truncate+0x456/0x680 fs/open.c:120
 do_sys_truncate.part.0+0xdc/0xf0 fs/open.c:143
 do_sys_truncate fs/open.c:137 [inline]
 SYSC_truncate fs/open.c:155 [inline]
 SyS_truncate+0x23/0x40 fs/open.c:153
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
Code: 17 af ff e9 bd fa ff ff 48 8b 7c 24 20 e8 f2 16 af ff e9 f4 fb ff ff 48 8b 7c 24 38 e8 f3 15 af ff e9 52 fe ff ff e8 f9 59 85 ff <0f> 0b e8 f2 59 85 ff 0f 0b e8 ab 17 af ff e9 b1 fa ff ff 48 8b 
RIP: __fat_get_block fs/fat/inode.c:161 [inline] RSP: ffff8880b3ff76d8
RIP: fat_get_block+0x647/0x750 fs/fat/inode.c:176 RSP: ffff8880b3ff76d8
---[ end trace fb004ccdcae2d1ee ]---

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/11/26 06:32 linux-4.14.y 179ef7fe8677 f4470a7b .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-4-14 kernel BUG in fat_get_block
2023/02/12 01:06 linux-4.14.y a8ad60f2af58 93e26d60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2023/01/12 20:12 linux-4.14.y c4215ee4771b 96166539 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2023/01/12 19:14 linux-4.14.y c4215ee4771b 96166539 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2023/01/12 19:10 linux-4.14.y c4215ee4771b 96166539 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2023/01/10 13:50 linux-4.14.y c4215ee4771b 48bc529a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2023/01/04 20:27 linux-4.14.y c4215ee4771b 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/25 00:40 linux-4.14.y c4215ee4771b 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/25 00:29 linux-4.14.y c4215ee4771b 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/21 22:22 linux-4.14.y c4215ee4771b 4067838e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/16 23:43 linux-4.14.y c4215ee4771b 05494336 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/16 00:15 linux-4.14.y c4215ee4771b 6f9c033e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/12 15:24 linux-4.14.y 65afe34ac33d 67be1ae7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/11 22:48 linux-4.14.y 65afe34ac33d 67be1ae7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/09 23:50 linux-4.14.y 65afe34ac33d 67be1ae7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/09 08:08 linux-4.14.y 65afe34ac33d 1034e5fa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/09 08:08 linux-4.14.y 65afe34ac33d 1034e5fa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/04 08:14 linux-4.14.y 179ef7fe8677 e080de16 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/12/02 01:14 linux-4.14.y 179ef7fe8677 e080de16 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/11/29 08:32 linux-4.14.y 179ef7fe8677 ca9683b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
2022/11/26 06:21 linux-4.14.y 179ef7fe8677 f4470a7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 kernel BUG in fat_get_block
* Struck through repros no longer work on HEAD.