[syzbot] [mm?] [reiserfs?] general protection fault in free_swap_cache (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 610a9b8f49fb Linux 6.7-rc8
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=106d2699e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=48ca880a5d56f9b1
dashboard link: https://syzkaller.appspot.com/bug?extid=fd93e36ced1a43a58f75
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f4cc41e80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14d526ade80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b1acb98afcb0/disk-610a9b8f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4f7d6503eb8c/vmlinux-610a9b8f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/927f38e505d9/bzImage-610a9b8f.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/c4f427645c60/mount_0.gz

The issue was bisected to:

commit 13d257503c0930010ef9eed78b689cec417ab741
Author: Shreyansh Chouhan <chouhan.sh...@gmail.com>
Date: Fri Jul 9 15:29:29 2021 +0000

reiserfs: check directory items on read from disk

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1603b8f9e80000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1503b8f9e80000
console output: https://syzkaller.appspot.com/x/log.txt?x=1103b8f9e80000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fd93e3...@syzkaller.appspotmail.com
Fixes: 13d257503c09 ("reiserfs: check directory items on read from disk")

general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 5048 Comm: sshd Not tainted 6.7.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:_compound_head include/linux/page-flags.h:247 [inline]
RIP: 0010:free_swap_cache+0x25/0x3d0 mm/swap_state.c:287
Code: 0f 1f 44 00 00 66 0f 1f 00 41 54 55 53 48 89 fb e8 90 e9 b2 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 34 03 00 00 4c 8b 63 08 31 ff 4c 89 e5 83 e5 01
RSP: 0018:ffffc900034df938 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81d3826a
RDX: 0000000000000001 RSI: ffffffff81d37b70 RDI: 0000000000000008
RBP: 0000000000000005 R08: 0000000000000004 R09: 0000000000000200
R10: 0000000000000004 R11: 0000000000000001 R12: 0000000000000200
R13: dffffc0000000000 R14: ffff88807490d010 R15: ffff88807490d008
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc22cebe00 CR3: 000000007c973000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
free_pages_and_swap_cache+0x60/0xa0 mm/swap_state.c:315
tlb_batch_pages_flush+0x9a/0x190 mm/mmu_gather.c:98
tlb_flush_mmu_free mm/mmu_gather.c:293 [inline]
tlb_flush_mmu mm/mmu_gather.c:300 [inline]
tlb_finish_mmu+0x14b/0x6f0 mm/mmu_gather.c:392
exit_mmap+0x38b/0xa70 mm/mmap.c:3321
__mmput+0x12a/0x4d0 kernel/fork.c:1349
mmput+0x62/0x70 kernel/fork.c:1371
exit_mm kernel/exit.c:567 [inline]
do_exit+0x9a5/0x2ad0 kernel/exit.c:856
do_group_exit+0xd4/0x2a0 kernel/exit.c:1018
get_signal+0x23b5/0x2790 kernel/signal.c:2904
arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x121/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296
do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x5623b9f0af8e
Code: Unable to access opcode bytes at 0x5623b9f0af64.
RSP: 002b:00007fff3b36f178 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: 0000000000000000 RBX: 00000000000668a0 RCX: 00007f85b4f19ad5
RDX: 00007fff3b36f180 RSI: 00007fff3b36f2b0 RDI: 0000000000000011
RBP: 00005623bb920260 R08: 0000000000000008 R09: 0000000000000000
R10: 00007fff3b36f848 R11: 0000000000000246 R12: 00005623b9f8faa4
R13: 0000000000000001 R14: 00005623b9f903e8 R15: 00007fff3b36f7c8
</TASK>
Modules linked in:
----------------
Code disassembly (best guess):
0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
5: 66 0f 1f 00 nopw (%rax)
9: 41 54 push %r12
b: 55 push %rbp
c: 53 push %rbx
d: 48 89 fb mov %rdi,%rbx
10: e8 90 e9 b2 ff call 0xffb2e9a5
15: 48 8d 7b 08 lea 0x8(%rbx),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 34 03 00 00 jne 0x368
34: 4c 8b 63 08 mov 0x8(%rbx),%r12
38: 31 ff xor %edi,%edi
3a: 4c 89 e5 mov %r12,%rbp
3d: 83 e5 01 and $0x1,%ebp


---
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 syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

[syzbot]

syzbot suspects this issue was fixed by commit:

commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <ja...@suse.cz>
Date: Wed Nov 1 17:43:10 2023 +0000

fs: Block writes to mounted block devices

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=170ec4b4180000
start commit: 610a9b8f49fb Linux 6.7-rc8
git tree: upstream

kernel config: https://syzkaller.appspot.com/x/.config?x=48ca880a5d56f9b1
dashboard link: https://syzkaller.appspot.com/bug?extid=fd93e36ced1a43a58f75

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f4cc41e80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14d526ade80000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: fs: Block writes to mounted block devices

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.