[v5.15] general protection fault in write_one_page

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: cc5ec8769306 Linux 5.15.196
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17e537cd980000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=09104e1ed4983b0e1b60
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c71c660545b2/disk-cc5ec876.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4f011826cca6/vmlinux-cc5ec876.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8ccd1a2c3f8c/bzImage-cc5ec876.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+09104e...@syzkaller.appspotmail.com

bn = 72c, index = 96
bn = 0, index = 0
bn = 0, index = 0
general protection fault, probably for non-canonical address 0xdffffc0000000037: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000001b8-0x00000000000001bf]
CPU: 1 PID: 4595 Comm: syz.3.63 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:write_one_page+0x278/0x600 mm/page-writeback.c:2431
Code: 04 00 00 00 e8 79 ce 1c 00 f0 41 ff 06 48 8b 44 24 18 48 8d 98 b8 01 00 00 48 89 d8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df <42> 80 3c 28 00 74 08 48 89 df e8 a9 cc 1c 00 48 8b 1b 48 89 d8 48
RSP: 0018:ffffc9000360f7e0 EFLAGS: 00010202
RAX: 0000000000000037 RBX: 00000000000001b8 RCX: ffffffff819f6757
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea0001693034
RBP: ffffc9000360f900 R08: dffffc0000000000 R09: fffff940002d2607
R10: fffff940002d2607 R11: 1ffffd40002d2606 R12: ffffea0001693008
R13: dffffc0000000000 R14: ffffea0001693034 R15: 1ffffd40002d2601
FS: 00007fef489f06c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d68d952950 CR3: 0000000066bbf000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
release_metapage+0x654/0xe10 fs/jfs/jfs_metapage.c:750
dtSearch+0x1b3f/0x2050 fs/jfs/jfs_dtree.c:793
jfs_symlink+0x6b3/0xe60 fs/jfs/namei.c:1016
vfs_symlink+0x247/0x3d0 fs/namei.c:4437
do_symlinkat+0x1be/0x6c0 fs/namei.c:4466
__do_sys_symlink fs/namei.c:4488 [inline]
__se_sys_symlink fs/namei.c:4486 [inline]
__x64_sys_symlink+0x7a/0x90 fs/namei.c:4486
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fef4a7896c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fef489f0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007fef4a9dffa0 RCX: 00007fef4a7896c9
RDX: 0000000000000000 RSI: 0000200000000e40 RDI: 0000200000001640
RBP: 00007fef4a80bf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fef4a9e0038 R14: 00007fef4a9dffa0 R15: 00007ffcb2d54f48
</TASK>
Modules linked in:
---[ end trace c24bcd5a1abcd6f9 ]---
RIP: 0010:write_one_page+0x278/0x600 mm/page-writeback.c:2431
Code: 04 00 00 00 e8 79 ce 1c 00 f0 41 ff 06 48 8b 44 24 18 48 8d 98 b8 01 00 00 48 89 d8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df <42> 80 3c 28 00 74 08 48 89 df e8 a9 cc 1c 00 48 8b 1b 48 89 d8 48
RSP: 0018:ffffc9000360f7e0 EFLAGS: 00010202
RAX: 0000000000000037 RBX: 00000000000001b8 RCX: ffffffff819f6757
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea0001693034
RBP: ffffc9000360f900 R08: dffffc0000000000 R09: fffff940002d2607
R10: fffff940002d2607 R11: 1ffffd40002d2606 R12: ffffea0001693008
R13: dffffc0000000000 R14: ffffea0001693034 R15: 1ffffd40002d2601
FS: 00007fef489f06c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000066bbf000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 04 00 add $0x0,%al
2: 00 00 add %al,(%rax)
4: e8 79 ce 1c 00 call 0x1cce82
9: f0 41 ff 06 lock incl (%r14)
d: 48 8b 44 24 18 mov 0x18(%rsp),%rax
12: 48 8d 98 b8 01 00 00 lea 0x1b8(%rax),%rbx
19: 48 89 d8 mov %rbx,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
27: fc ff df
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 df mov %rbx,%rdi
34: e8 a9 cc 1c 00 call 0x1ccce2
39: 48 8b 1b mov (%rbx),%rbx
3c: 48 89 d8 mov %rbx,%rax
3f: 48 rex.W


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