[syzbot] general protection fault in lmLogSync (2)

[syzbot <syzbot+e14b1036481911ae4d77@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    c3e0e1e23c70 Merge tag 'irq_urgent_for_v6.0' of git://git...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1599a048880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5
dashboard link: https://syzkaller.appspot.com/bug?extid=e14b1036481911ae4d77
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13b404c0880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=179f60b8880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e7f1f925f94e/disk-c3e0e1e2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/830dabeedf0d/vmlinux-c3e0e1e2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e14b1036481911ae4d77@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 PID: 3619 Comm: syz-executor117 Not tainted 6.0.0-rc7-syzkaller-00081-gc3e0e1e23c70 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x227/0xb00 fs/jfs/jfs_logmgr.c:937
Code: b2 fe 49 8d 5f f0 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 37 66 da fe 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 1a 66 da fe 48 8b 3b e8 32 89 b2
RSP: 0018:ffffc900039dfae0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: 4daf7eec4cfcb600
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900039dfbe8 R08: ffffffff81b29a43 R09: ffffc900039dfa30
R10: fffff5200073bf49 R11: 1ffff9200073bf46 R12: dffffc0000000000
R13: ffff88807736d800 R14: 0000000000000000 R15: ffff888020ba2638
FS:  00005555574fa300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555557503628 CR3: 0000000021420000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 jfs_syncpt+0x79/0x90 fs/jfs/jfs_logmgr.c:1041
 jfs_sync_fs+0x86/0xa0 fs/jfs/super.c:685
 sync_filesystem+0xe8/0x220 fs/sync.c:56
 generic_shutdown_super+0x6b/0x300 fs/super.c:474
 kill_block_super+0x79/0xd0 fs/super.c:1427
 deactivate_locked_super+0xa7/0xf0 fs/super.c:332
 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186
 task_work_run+0x146/0x1c0 kernel/task_work.c:177
 ptrace_notify+0x29a/0x340 kernel/signal.c:2353
 ptrace_report_syscall include/linux/ptrace.h:420 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline]
 syscall_exit_work+0x8c/0xe0 kernel/entry/common.c:249
 syscall_exit_to_user_mode_prepare+0x63/0xc0 kernel/entry/common.c:276
 __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline]
 syscall_exit_to_user_mode+0xa/0x60 kernel/entry/common.c:294
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f50d6eec917
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 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:00007ffcf5fdfe28 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f50d6eec917
RDX: 00007ffcf5fdfee9 RSI: 000000000000000a RDI: 00007ffcf5fdfee0
RBP: 00007ffcf5fdfee0 R08: 00000000ffffffff R09: 00007ffcf5fdfcc0
R10: 00005555574fb653 R11: 0000000000000206 R12: 00007ffcf5fe0f50
R13: 00005555574fb5f0 R14: 00007ffcf5fdfe50 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x227/0xb00 fs/jfs/jfs_logmgr.c:937
Code: b2 fe 49 8d 5f f0 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 37 66 da fe 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 1a 66 da fe 48 8b 3b e8 32 89 b2
RSP: 0018:ffffc900039dfae0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: 4daf7eec4cfcb600
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900039dfbe8 R08: ffffffff81b29a43 R09: ffffc900039dfa30
R10: fffff5200073bf49 R11: 1ffff9200073bf46 R12: dffffc0000000000
R13: ffff88807736d800 R14: 0000000000000000 R15: ffff888020ba2638
FS:  00005555574fa300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005613768c4db8 CR3: 0000000021420000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	b2 fe                	mov    $0xfe,%dl
   2:	49 8d 5f f0          	lea    -0x10(%r15),%rbx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 37 66 da fe       	callq  0xfeda6653
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 83 c3 30          	add    $0x30,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 1a 66 da fe       	callq  0xfeda6653
  39:	48 8b 3b             	mov    (%rbx),%rdi
  3c:	e8                   	.byte 0xe8
  3d:	32                   	.byte 0x32
  3e:	89                   	.byte 0x89
  3f:	b2                   	.byte 0xb2


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