syzbot


general protection fault in direct2indirect

Status: upstream: reported C repro on 2023/01/01 14:35
Subsystems: reiserfs (incorrect?)
Reported-by: syzbot+e69a9406662c63f12e24@syzkaller.appspotmail.com
First crash: 84d, last: 23d

Cause bisection: failed (error log, bisect log)

Sample crash report:
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): using 3.5.x disk format
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
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 549. Fsck?
REISERFS (device loop0): Remounting filesystem read-only
general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 PID: 5068 Comm: syz-executor435 Not tainted 6.2.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2200 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
RIP: 0010:direct2indirect+0x916/0x17c0 fs/reiserfs/tail_conversion.c:119
Code: 48 8b 04 24 4a 8d 5c 38 10 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 43 03 00 00 48 63 1b 49 83 c6 28 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 8c 8a b2 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90003c7f100 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffff888021c93a80
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: ffffc90003c7f270 R08: ffffffff822ef83e R09: ffffffff822e1c5d
R10: 0000000000000002 R11: ffff888021c93a80 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000028 R15: 0000000000000010
FS:  0000555555b8a3c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000208 CR3: 000000002a8a2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 reiserfs_get_block+0x4c9a/0x5180 fs/reiserfs/inode.c:949
 __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991
 reiserfs_write_begin+0x247/0x510 fs/reiserfs/inode.c:2775
 generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3772
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3900
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3932
 call_write_iter include/linux/fs.h:2186 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x7dc/0xc50 fs/read_write.c:584
 ksys_write+0x177/0x2a0 fs/read_write.c:637
 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: 0033:0x7f709ad71ed9
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:00007ffd885a00d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffd885a00e8 RCX: 00007f709ad71ed9
RDX: 00000000175d900f RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00007ffd885a00e0 R08: 00007ffd885a00e0 R09: 00007f709ad2f490
R10: 00007ffd885a00e0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
RIP: 0010:item_head fs/reiserfs/reiserfs.h:2200 [inline]
RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
RIP: 0010:direct2indirect+0x916/0x17c0 fs/reiserfs/tail_conversion.c:119
Code: 48 8b 04 24 4a 8d 5c 38 10 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 43 03 00 00 48 63 1b 49 83 c6 28 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 8c 8a b2 ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90003c7f100 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffff888021c93a80
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: ffffc90003c7f270 R08: ffffffff822ef83e R09: ffffffff822e1c5d
R10: 0000000000000002 R11: ffff888021c93a80 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000028 R15: 0000000000000010
FS:  0000555555b8a3c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000208 CR3: 000000002a8a2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 8b 04 24          	mov    (%rsp),%rax
   4:	4a 8d 5c 38 10       	lea    0x10(%rax,%r15,1),%rbx
   9:	48 89 d8             	mov    %rbx,%rax
   c:	48 c1 e8 03          	shr    $0x3,%rax
  10:	0f b6 04 10          	movzbl (%rax,%rdx,1),%eax
  14:	84 c0                	test   %al,%al
  16:	0f 85 43 03 00 00    	jne    0x35f
  1c:	48 63 1b             	movslq (%rbx),%rbx
  1f:	49 83 c6 28          	add    $0x28,%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1) <-- trapping instruction
  2e:	74 12                	je     0x42
  30:	4c 89 f7             	mov    %r14,%rdi
  33:	e8 8c 8a b2 ff       	callq  0xffb28ac4
  38:	48                   	rex.W
  39:	ba 00 00 00 00       	mov    $0x0,%edx
  3e:	00 fc                	add    %bh,%ah

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci2-upstream-fs 2023/02/27 06:51 upstream f3a2439f20d9 44712fbc .config console log report syz C
* Struck through repros no longer work on HEAD.
Crashes (11):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci2-upstream-fs 2022/12/28 14:51 upstream 1b929c02afd3 44712fbc .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] general protection fault in direct2indirect
ci2-upstream-fs 2023/01/25 22:53 upstream 948ef7bb70c4 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
ci2-upstream-fs 2023/01/22 01:13 upstream f883675bf652 cc0f9968 .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
ci2-upstream-fs 2023/01/19 22:43 upstream 081edded9b38 71197f3a .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
ci2-upstream-fs 2023/01/18 21:56 upstream c1649ec55708 4620c2d9 .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
ci2-upstream-fs 2023/01/12 17:09 upstream e8f60cd7db24 96166539 .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
ci2-upstream-fs 2023/01/09 20:45 upstream 1fe4fd6f5cad 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
ci2-upstream-fs 2023/01/05 06:02 upstream 512dee0c00ad 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
ci2-upstream-fs 2022/12/31 04:32 upstream bff687b3dad6 ab32d508 .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
ci2-upstream-fs 2022/12/29 16:56 upstream 1b929c02afd3 44712fbc .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
ci2-upstream-fs 2022/12/28 14:23 upstream 1b929c02afd3 44712fbc .config console log report info [disk image] [vmlinux] [kernel image] general protection fault in direct2indirect
* Struck through repros no longer work on HEAD.