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Subject[syzbot] general protection fault in write_special_inodes
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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=11189000880000
kernel config: https://syzkaller.appspot.com/x/.config?x=a1992c90769e07
dashboard link: https://syzkaller.appspot.com/bug?extid=c732e285f8fc38d15916
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1079c41f080000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=154912e0880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e29a1fa19166/disk-c3e0e1e2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fd7739458f56/vmlinux-c3e0e1e2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c732e285f8fc38d15916@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: 0 PID: 3611 Comm: syz-executor329 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+0xa6/0x170 fs/jfs/jfs_logmgr.c:208
Code: 8b 7d 30 41 ff d4 48 8d 7b 28 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 ab 00 00 00 4c 8b 6b 28 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 88 00 00 00 49 8b 7d 30 41 ff d4 48 8d bb b0 00
RSP: 0018:ffffc90003037c20 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffff888017347c00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81a29052 RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81a39370
R13: 0000000000000000 R14: ffff88807d3ed800 R15: ffff88801a953040
FS: 0000555556aaa300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557c33749000 CR3: 0000000016fbf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
lmLogSync+0x458/0x7b0 fs/jfs/jfs_logmgr.c:937
jfs_syncpt+0x89/0xa0 fs/jfs/jfs_logmgr.c:1041
jfs_sync_fs+0x80/0xa0 fs/jfs/super.c:685
sync_filesystem.part.0+0x75/0x1d0 fs/sync.c:56
sync_filesystem+0x8b/0xc0 fs/sync.c:43
generic_shutdown_super+0x70/0x400 fs/super.c:474
kill_block_super+0x97/0xf0 fs/super.c:1427
deactivate_locked_super+0x94/0x160 fs/super.c:332
deactivate_super+0xad/0xd0 fs/super.c:363
cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1186
task_work_run+0xdd/0x1a0 kernel/task_work.c:177
ptrace_notify+0x114/0x140 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 kernel/entry/common.c:249 [inline]
syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:276
__syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline]
syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:294
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd021dc0917
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:00007ffed2de9fd8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fd021dc0917
RDX: 00007ffed2dea099 RSI: 000000000000000a RDI: 00007ffed2dea090
RBP: 00007ffed2dea090 R08: 00000000ffffffff R09: 00007ffed2de9e70
R10: 0000555556aab653 R11: 0000000000000206 R12: 00007ffed2deb100
R13: 0000555556aab5f0 R14: 00007ffed2dea000 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes+0xa6/0x170 fs/jfs/jfs_logmgr.c:208
Code: 8b 7d 30 41 ff d4 48 8d 7b 28 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 ab 00 00 00 4c 8b 6b 28 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 88 00 00 00 49 8b 7d 30 41 ff d4 48 8d bb b0 00
RSP: 0018:ffffc90003037c20 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffff888017347c00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81a29052 RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81a39370
R13: 0000000000000000 R14: ffff88807d3ed800 R15: ffff88801a953040
FS: 0000555556aaa300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff786565d8 CR3: 0000000016fbf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 8b 7d 30 mov 0x30(%rbp),%edi
3: 41 ff d4 callq *%r12
6: 48 8d 7b 28 lea 0x28(%rbx),%rdi
a: 48 89 f8 mov %rdi,%rax
d: 48 c1 e8 03 shr $0x3,%rax
11: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
15: 0f 85 ab 00 00 00 jne 0xc6
1b: 4c 8b 6b 28 mov 0x28(%rbx),%r13
1f: 49 8d 7d 30 lea 0x30(%r13),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction
2e: 0f 85 88 00 00 00 jne 0xbc
34: 49 8b 7d 30 mov 0x30(%r13),%rdi
38: 41 ff d4 callq *%r12
3b: 48 rex.W
3c: 8d .byte 0x8d
3d: bb .byte 0xbb
3e: b0 00 mov $0x0,%al


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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