syzbot


kernel BUG in ext4_ind_remove_space

Status: upstream: reported C repro on 2022/02/09 11:57
Reported-by: syzbot+227839a33b4efda3cafd@syzkaller.appspotmail.com
First crash: 854d, last: 673d
Fix bisection the fix commit could be any of (bisect log):
  21ad423fe521 Linux 4.14.265
  65640c873dcf Linux 4.14.292
  
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in ext4_ind_remove_space ext4 C error done 10 800d 850d 22/28 fixed on 2023/02/24 13:50
linux-4.19 kernel BUG in ext4_ind_remove_space C error 3 685d 872d 0/1 upstream: reported C repro on 2022/01/23 01:21
android-5-10 kernel BUG in ext4_ind_remove_space C error 55 764d 874d 2/2 fixed on 2022/05/13 02:56
android-54 kernel BUG in ext4_ind_remove_space C 1 875d 875d 2/2 fixed on 2022/06/08 16:26
Fix bisection attempts (7)
Created Duration User Patch Repo Result
2022/09/09 00:46 21m bisect fix linux-4.14.y job log (2)
2022/08/09 12:48 21m bisect fix linux-4.14.y job log (0) log
2022/07/10 12:27 20m bisect fix linux-4.14.y job log (0) log
2022/06/10 11:46 25m bisect fix linux-4.14.y job log (0) log
2022/05/11 10:31 23m bisect fix linux-4.14.y job log (0) log
2022/04/10 17:43 25m bisect fix linux-4.14.y job log (0) log
2022/03/11 16:52 22m bisect fix linux-4.14.y job log (0) log

Sample crash report:
audit: type=1800 audit(1644407705.577:2): pid=7974 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor333" name="bus" dev="sda1" ino=13861 res=0
EXT4-fs warning (device sda1): ext4_block_to_path:105: block 1074791436 > max in inode 13861
------------[ cut here ]------------
kernel BUG at fs/ext4/indirect.c:1236!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7974 Comm: syz-executor333 Not tainted 4.14.265-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88809c2f6140 task.stack: ffff888091668000
RIP: 0010:ext4_ind_remove_space+0xe47/0x1250 fs/ext4/indirect.c:1236
RSP: 0018:ffff88809166fb20 EFLAGS: 00010297
RAX: ffff88809c2f6140 RBX: 000000004010040c RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff878bbcc0 RDI: ffffed10122cdf31
RBP: 0000000000001000 R08: 000000000000005c R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809166fbd0
R13: 0000000000000003 R14: 000000004010040c R15: ffff88808e935730
FS:  00005555563c3300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020400002 CR3: 00000000abf79000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_punch_hole+0xcf4/0x1000 fs/ext4/inode.c:4318
 ext4_fallocate+0x327/0x1d80 fs/ext4/extents.c:4968
 vfs_fallocate+0x346/0x790 fs/open.c:319
 SYSC_fallocate fs/open.c:342 [inline]
 SyS_fallocate+0x4a/0x80 fs/open.c:336
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f4c5f1930d9
RSP: 002b:00007fffb5cdd4a8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4c5f1930d9
RDX: 0000000001000000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 00007f4c5f1570c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000ffeffeff000 R11: 0000000000000246 R12: 00007f4c5f157150
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 01 00 0f 85 4c 03 00 00 48 8b 0b 4c 89 fe 44 8b 4c 24 20 48 8b 7c 24 10 48 83 c1 04 e8 73 bd ff ff e9 f5 f6 ff ff e8 79 45 9c ff <0f> 0b e8 72 45 9c ff 48 8b 7c 24 10 31 d2 4c 89 fe 8b 84 24 b0 
RIP: ext4_ind_remove_space+0xe47/0x1250 fs/ext4/indirect.c:1236 RSP: ffff88809166fb20
---[ end trace 48a577c924040e25 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/02/09 11:56 linux-4.14.y 21ad423fe521 0b33604d .config console log report syz C ci2-linux-4-14 kernel BUG in ext4_ind_remove_space
* Struck through repros no longer work on HEAD.