syzbot


general protection fault in txBegin

Status: upstream: reported on 2022/12/30 21:46
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+f65a55035f84abcc6eed@syzkaller.appspotmail.com
First crash: 534d, last: 534d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 BUG: unable to handle kernel paging request in txBegin origin:upstream C 4 29d 453d 0/3 upstream: reported C repro on 2023/03/21 08:56
linux-5.15 BUG: unable to handle kernel paging request in txBegin origin:upstream missing-backport C error 3 339d 453d 0/3 upstream: reported C repro on 2023/03/21 10:23
upstream KASAN: null-ptr-deref Read in txBegin jfs C error 30 349d 484d 23/27 fixed on 2023/10/12 12:48

Sample crash report:
overlayfs: upper fs does not support tmpfile.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 11844 Comm: syz-executor.1 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
task: ffff888070a46500 task.stack: ffff8880704d8000
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:328 [inline]
RIP: 0010:txBegin+0x12c/0x800 fs/jfs/jfs_txnmgr.c:379
RSP: 0018:ffff8880704df7c8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888070a46500 RCX: ffffc900062bd000
RDX: 0000000000000008 RSI: ffffffff823e5527 RDI: 0000000000000040
RBP: 0000000000000000 R08: ffffffff8b9cb828 R09: 00000000000401e5
R10: ffff888070a46dd8 R11: ffff888070a46500 R12: 0000000000000000
R13: ffffffff87b54600 R14: 0000000000000001 R15: ffff8880951420c0
FS:  00007f4b11d5f700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd7a5e4c10 CR3: 000000009a532000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000006
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __jfs_xattr_set+0x91/0x130 fs/jfs/xattr.c:928
 __vfs_setxattr+0xdc/0x130 fs/xattr.c:150
 __vfs_setxattr_noperm+0xfd/0x3d0 fs/xattr.c:181
 __vfs_setxattr_locked+0x14d/0x250 fs/xattr.c:239
 vfs_setxattr+0xcf/0x230 fs/xattr.c:256
 ovl_do_setxattr fs/overlayfs/overlayfs.h:138 [inline]
 ovl_fill_super+0x1127/0x2610 fs/overlayfs/super.c:1023
 mount_nodev+0x4c/0xf0 fs/super.c:1180
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a30 fs/namespace.c:2905
 SYSC_mount fs/namespace.c:3121 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3098
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f4b137ed0a9
RSP: 002b:00007f4b11d5f168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4b1390cf80 RCX: 00007f4b137ed0a9
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f4b13848ae9 R08: 0000000020000340 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffe24caaff R14: 00007f4b11d5f300 R15: 0000000000022000
Code: 83 e4 02 48 89 04 24 e8 23 05 17 ff 45 85 e4 75 65 e8 19 05 17 ff 48 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 26 06 00 00 48 8b 45 40 a8 04 0f 85 8a 01 00 
RIP: constant_test_bit arch/x86/include/asm/bitops.h:328 [inline] RSP: ffff8880704df7c8
RIP: txBegin+0x12c/0x800 fs/jfs/jfs_txnmgr.c:379 RSP: ffff8880704df7c8
---[ end trace 485f6fcdcd12c061 ]---
----------------
Code disassembly (best guess):
   0:	83 e4 02             	and    $0x2,%esp
   3:	48 89 04 24          	mov    %rax,(%rsp)
   7:	e8 23 05 17 ff       	callq  0xff17052f
   c:	45 85 e4             	test   %r12d,%r12d
   f:	75 65                	jne    0x76
  11:	e8 19 05 17 ff       	callq  0xff17052f
  16:	48 8d 7d 40          	lea    0x40(%rbp),%rdi
  1a:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  21:	fc ff df
  24:	48 89 fa             	mov    %rdi,%rdx
  27:	48 c1 ea 03          	shr    $0x3,%rdx
* 2b:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2f:	0f 85 26 06 00 00    	jne    0x65b
  35:	48 8b 45 40          	mov    0x40(%rbp),%rax
  39:	a8 04                	test   $0x4,%al
  3b:	0f                   	.byte 0xf
  3c:	85                   	.byte 0x85
  3d:	8a 01                	mov    (%rcx),%al

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/30 21:46 linux-4.14.y c4215ee4771b ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 general protection fault in txBegin
* Struck through repros no longer work on HEAD.