syzbot


general protection fault in __xfs_free_extent

Status: upstream: reported C repro on 2023/05/28 08:42
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+cd9f520086be60323733@syzkaller.appspotmail.com
First crash: 277d, last: 6d22h
Fix commit to backport (bisect log) :
tree: upstream
commit b2ccab3199aa7cea9154d80ea2585312c5f6eba0
Author: Darrick J. Wong <djwong@kernel.org>
Date: Wed Apr 12 01:59:53 2023 +0000

  xfs: pass per-ag references to xfs_free_extent

  
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: BUG: unable to handle kernel NULL pointer dereference in __xfs_free_extent (log)
Repro: C syz .config
  
Bug presence (2)
Date Name Commit Repro Result
2023/05/28 linux-6.1.y (ToT) a343b0dd87b4 C [report] general protection fault in __xfs_free_extent
2023/05/28 upstream (ToT) 7877cb91f108 C Didn't crash
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 BUG: unable to handle kernel paging request in __xfs_free_extent origin:lts-only C error 26 6d23h 277d 0/3 upstream: reported C repro on 2023/05/28 08:56
upstream general protection fault in __xfs_free_extent xfs C error done 17 319d 438d 22/26 fixed on 2023/06/08 14:41
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2023/11/11 01:30 4h35m fix candidate upstream job log (1)
2023/10/27 07:26 1h39m bisect fix linux-6.1.y job log (0) log
2023/09/24 11:04 1h31m bisect fix linux-6.1.y job log (0) log

Sample crash report:
loop0: detected capacity change from 0 to 32768
XFS (loop0): Mounting V5 Filesystem
XFS (loop0): Ending clean mount
XFS (loop0): Quotacheck needed: Please wait.
XFS (loop0): Quotacheck: Done.
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 3543 Comm: syz-executor274 Not tainted 6.1.30-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:xfs_free_extent_fix_freelist fs/xfs/libxfs/xfs_alloc.c:3358 [inline]
RIP: 0010:__xfs_free_extent+0x1f6/0x610 fs/xfs/libxfs/xfs_alloc.c:3407
Code: 00 74 05 e8 fc c6 cf fe 4c 89 ac 24 88 00 00 00 4c 89 7c 24 08 49 8d 5f 08 48 89 d8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df <42> 0f b6 04 38 84 c0 0f 85 06 03 00 00 44 8b 23 4c 8d b4 24 80 00
RSP: 0018:ffffc9000393f540 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000080 RSI: 0000000000000000 RDI: ffffc9000393f5c8
RBP: ffffc9000393f6f0 R08: dffffc0000000000 R09: ffffc9000393f5d0
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100e4e1650
R13: ffff88807be3a000 R14: dffffc0000000000 R15: dffffc0000000000
FS:  000055555706d300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b07d50b40 CR3: 000000001a394000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 xfs_free_extent fs/xfs/libxfs/xfs_alloc.h:147 [inline]
 xfs_ag_extend_space+0x397/0x5d0 fs/xfs/libxfs/xfs_ag.c:985
 xfs_growfs_data_private fs/xfs/xfs_fsops.c:151 [inline]
 xfs_growfs_data+0x9b2/0x11c0 fs/xfs/xfs_fsops.c:294
 xfs_file_ioctl+0x1170/0x1700 fs/xfs/xfs_ioctl.c:2068
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3b07d78959
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc4d528fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f3b07d78959
RDX: 0000000020000540 RSI: 000000004010586e RDI: 0000000000000004
RBP: 00007f3b07d381f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3b07d38280
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:xfs_free_extent_fix_freelist fs/xfs/libxfs/xfs_alloc.c:3358 [inline]
RIP: 0010:__xfs_free_extent+0x1f6/0x610 fs/xfs/libxfs/xfs_alloc.c:3407
Code: 00 74 05 e8 fc c6 cf fe 4c 89 ac 24 88 00 00 00 4c 89 7c 24 08 49 8d 5f 08 48 89 d8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df <42> 0f b6 04 38 84 c0 0f 85 06 03 00 00 44 8b 23 4c 8d b4 24 80 00
RSP: 0018:ffffc9000393f540 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000080 RSI: 0000000000000000 RDI: ffffc9000393f5c8
RBP: ffffc9000393f6f0 R08: dffffc0000000000 R09: ffffc9000393f5d0
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100e4e1650
R13: ffff88807be3a000 R14: dffffc0000000000 R15: dffffc0000000000
FS:  000055555706d300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b07d50b40 CR3: 000000001a394000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	74 05                	je     0x7
   2:	e8 fc c6 cf fe       	callq  0xfecfc703
   7:	4c 89 ac 24 88 00 00 	mov    %r13,0x88(%rsp)
   e:	00
   f:	4c 89 7c 24 08       	mov    %r15,0x8(%rsp)
  14:	49 8d 5f 08          	lea    0x8(%r15),%rbx
  18:	48 89 d8             	mov    %rbx,%rax
  1b:	48 c1 e8 03          	shr    $0x3,%rax
  1f:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
  26:	fc ff df
* 29:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 06 03 00 00    	jne    0x33c
  36:	44 8b 23             	mov    (%rbx),%r12d
  39:	4c                   	rex.WR
  3a:	8d                   	.byte 0x8d
  3b:	b4 24                	mov    $0x24,%ah
  3d:	80                   	.byte 0x80

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/05/28 11:12 linux-6.1.y a343b0dd87b4 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan general protection fault in __xfs_free_extent
2023/07/02 17:08 linux-6.1.y 0f4ac6b4c5f0 bfc47836 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan general protection fault in __xfs_free_extent
2023/06/28 09:06 linux-6.1.y e84a4e368abe 4cd5bb25 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan general protection fault in __xfs_free_extent
2023/06/28 08:52 linux-6.1.y e84a4e368abe 4cd5bb25 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan general protection fault in __xfs_free_extent
2024/02/22 14:18 linux-6.1.y 8b4118fabd6e 345111b5 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/05/29 00:58 linux-6.1.y a343b0dd87b4 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/05/29 00:12 linux-6.1.y a343b0dd87b4 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/05/28 23:51 linux-6.1.y a343b0dd87b4 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/05/28 23:35 linux-6.1.y a343b0dd87b4 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/07/04 08:12 linux-6.1.y 0f4ac6b4c5f0 6e553898 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in __xfs_free_extent
2023/05/30 08:57 linux-6.1.y a343b0dd87b4 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in __xfs_free_extent
2023/05/28 16:19 linux-6.1.y a343b0dd87b4 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in __xfs_free_extent
2023/05/28 08:41 linux-6.1.y a343b0dd87b4 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in __xfs_free_extent
2024/02/22 07:45 linux-6.1.y 8b4118fabd6e 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2024/01/21 12:24 linux-6.1.y 8fd7f4462453 9bd8dcda .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/07/16 13:59 linux-6.1.y 61fd484b2cf6 35d9ecc5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/06/20 11:28 linux-6.1.y ca87e77a2ef8 09ffe269 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/06/20 11:07 linux-6.1.y ca87e77a2ef8 09ffe269 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/06/20 09:03 linux-6.1.y ca87e77a2ef8 09ffe269 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/06/20 08:49 linux-6.1.y ca87e77a2ef8 09ffe269 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
2023/05/28 08:42 linux-6.1.y a343b0dd87b4 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in __xfs_free_extent
* Struck through repros no longer work on HEAD.