syzbot


general protection fault in prepare_for_delete_or_cut

Status: upstream: reported C repro on 2023/01/01 21:41
Subsystems: fat reiserfs
[Documentation on labels]
Reported-by: syzbot+9eac28cc0c86d33be42f@syzkaller.appspotmail.com
First crash: 558d, last: 529d
Fix bisection: failed (error log, bisect log)
  
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in prepare_for_delete_or_cut reiserfs C error done 71 169d 554d 0/27 auto-obsoleted due to no activity on 2024/05/03 14:06
linux-4.14 general protection fault in prepare_for_delete_or_cut reiserfs fat C 2 514d 561d 0/1 upstream: reported C repro on 2022/12/30 06:10
linux-6.1 BUG: unable to handle kernel paging request in prepare_for_delete_or_cut origin:upstream C 2 5d16h 133d 0/3 upstream: reported C repro on 2024/03/02 01:50
linux-5.15 BUG: unable to handle kernel paging request in prepare_for_delete_or_cut origin:upstream C error 1 84d 84d 0/3 upstream: reported C repro on 2024/04/20 01:57

Sample crash report:
REISERFS error (device loop0): vs-13050 reiserfs_update_sd_size: i/o failure occurred trying to update [2 2 0x0 SD] stat data
REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 4029, free_space(entry_count) 2
REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 532. Fsck?
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
CPU: 1 PID: 8113 Comm: syz-executor254 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2186 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2202 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2228 [inline]
RIP: 0010:prepare_for_delete_or_cut+0x12a/0x1b00 fs/reiserfs/stree.c:1060
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 57 19 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 69 18 00 00 48 8b 4b 28 49 63 c4 48 8d 44 40 03
RSP: 0018:ffff8880950e7450 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880950e7ad0
RDX: 0000000000000005 RSI: ffffffff81d4eb6f RDI: 0000000000000028
RBP: ffff8880950e7650 R08: ffff8880950e7660 R09: ffff8880950e7650
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88808a867780 R14: 1ffff11012a1cf62 R15: ffff8880950e7660
FS:  0000555556133300(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e54b9cb8e0 CR3: 00000000abdaa000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 reiserfs_cut_from_item+0x1ef/0x1960 fs/reiserfs/stree.c:1692
 reiserfs_do_truncate+0x64a/0x10c0 fs/reiserfs/stree.c:1983
 reiserfs_truncate_file+0x1b1/0x1030 fs/reiserfs/inode.c:2320
 reiserfs_file_release+0x982/0xd90 fs/reiserfs/file.c:115
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f8099798313
Code: c7 c2 c0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb ba 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8
RSP: 002b:00007fff3f184738 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f8099798313
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fff3f184748 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff3f184750
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 225a91012c961b8b ]---
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2186 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2202 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2228 [inline]
RIP: 0010:prepare_for_delete_or_cut+0x12a/0x1b00 fs/reiserfs/stree.c:1060
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 57 19 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 69 18 00 00 48 8b 4b 28 49 63 c4 48 8d 44 40 03
RSP: 0018:ffff8880950e7450 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880950e7ad0
RDX: 0000000000000005 RSI: ffffffff81d4eb6f RDI: 0000000000000028
RBP: ffff8880950e7650 R08: ffff8880950e7660 R09: ffff8880950e7650
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88808a867780 R14: 1ffff11012a1cf62 R15: ffff8880950e7660
FS:  0000555556133300(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e54b9cb8e0 CR3: 00000000abdaa000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 57 19 00 00    	jne    0x1965
   e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  15:	fc ff df
  18:	48 8b 1b             	mov    (%rbx),%rbx
  1b:	48 8d 7b 28          	lea    0x28(%rbx),%rdi
  1f:	48 89 fa             	mov    %rdi,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
* 26:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2a:	0f 85 69 18 00 00    	jne    0x1899
  30:	48 8b 4b 28          	mov    0x28(%rbx),%rcx
  34:	49 63 c4             	movslq %r12d,%rax
  37:	48 8d 44 40 03       	lea    0x3(%rax,%rax,2),%rax

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/20 04:33 linux-4.19.y 3f8a27f9e27b 71197f3a .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 general protection fault in prepare_for_delete_or_cut
2023/01/01 21:41 linux-4.19.y 3f8a27f9e27b ab32d508 .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 general protection fault in prepare_for_delete_or_cut
2023/01/31 07:10 linux-4.19.y 3f8a27f9e27b b68fb8d6 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in prepare_for_delete_or_cut
* Struck through repros no longer work on HEAD.