[syzbot] [reiserfs?] [fat?] [mm?] general protection fault in unlink_file_vma (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 547cc9be86f4 Merge tag 'perf_urgent_for_v6.4' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=120f1677280000
kernel config: https://syzkaller.appspot.com/x/.config?x=2cbd298d0aff1140
dashboard link: https://syzkaller.appspot.com/bug?extid=7fbdbd17a5bd6d01bc65
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=13a58757280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=134a0f1f280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7daf3e78f564/disk-547cc9be.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cb3208252f02/vmlinux-547cc9be.xz
kernel image: https://storage.googleapis.com/syzbot-assets/209415d43289/bzImage-547cc9be.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/ad9db3ff710e/mount_1.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7fbdbd...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000030: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000180-0x0000000000000187]
CPU: 0 PID: 4994 Comm: udevd Not tainted 6.4.0-rc7-syzkaller-00234-g547cc9be86f4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:__lock_acquire+0xe01/0x5f30 kernel/locking/lockdep.c:4956
Code: 00 00 3b 05 01 b0 59 0f 0f 87 7a 09 00 00 41 be 01 00 00 00 e9 84 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 9e 33 00 00 49 81 3c 24 20 38 16 90 0f 84 cd f2
RSP: 0000:ffffc90003b0f5d8 EFLAGS: 00010016

RAX: dffffc0000000000 RBX: 1ffff92000761eec RCX: 0000000000000000
RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000180
RBP: ffff888076abbb80 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff81d6f0d2 R12: 0000000000000180
R13: 0000000000000000 R14: 0000000000000180 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff9 CR3: 00000000278f2000 CR4: 0000000000350ef0
Call Trace:
<TASK>
lock_acquire kernel/locking/lockdep.c:5705 [inline]
lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
down_write+0x92/0x200 kernel/locking/rwsem.c:1573
i_mmap_lock_write include/linux/fs.h:485 [inline]
unlink_file_vma+0x81/0x120 mm/mmap.c:128
free_pgtables+0x147/0x930 mm/memory.c:386
exit_mmap+0x29e/0x930 mm/mmap.c:3118
__mmput+0x128/0x4c0 kernel/fork.c:1351
mmput+0x60/0x70 kernel/fork.c:1373
exit_mm kernel/exit.c:567 [inline]
do_exit+0x9b0/0x29b0 kernel/exit.c:861
do_group_exit+0xd4/0x2a0 kernel/exit.c:1024
get_signal+0x2318/0x25b0 kernel/signal.c:2876
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310
exc_page_fault+0xc0/0x170 arch/x86/mm/fault.c:1593
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7fd9a06c926e
Code: Unable to access opcode bytes at 0x7fd9a06c9244.
RSP: 002b:00007fffd3ceb1d0 EFLAGS: 00010202
RAX: 000056344395de44 RBX: fffffffffffffe60 RCX: 000000000000001f
RDX: 000056344395f79e RSI: 000056312086e010 RDI: 0000000000000001
RBP: 0000563120882320 R08: 0000000000000000 R09: 8ad69a18ea1c0cdc
R10: 00000000ffffffff R11: 0000000000000007 R12: fffffffffffffff1
R13: 000056311ea72040 R14: 0000000000000000 R15: 000056312086e910
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__lock_acquire+0xe01/0x5f30 kernel/locking/lockdep.c:4956
Code: 00 00 3b 05 01 b0 59 0f 0f 87 7a 09 00 00 41 be 01 00 00 00 e9 84 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 9e 33 00 00 49 81 3c 24 20 38 16 90 0f 84 cd f2
RSP: 0000:ffffc90003b0f5d8 EFLAGS: 00010016
RAX: dffffc0000000000 RBX: 1ffff92000761eec RCX: 0000000000000000
RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000180
RBP: ffff888076abbb80 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff81d6f0d2 R12: 0000000000000180
R13: 0000000000000000 R14: 0000000000000180 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff9 CR3: 00000000278f2000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 3b 05 01 b0 59 0f cmp 0xf59b001(%rip),%eax # 0xf59b009
8: 0f 87 7a 09 00 00 ja 0x988
e: 41 be 01 00 00 00 mov $0x1,%r14d
14: e9 84 00 00 00 jmpq 0x9d
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 4c 89 e2 mov %r12,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 9e 33 00 00 jne 0x33d2
34: 49 81 3c 24 20 38 16 cmpq $0xffffffff90163820,(%r12)
3b: 90
3c: 0f .byte 0xf
3d: 84 cd test %cl,%ch
3f: f2 repnz


---
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[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=12d80bba180000
start commit: 547cc9be86f4 Merge tag 'perf_urgent_for_v6.4' of git://git..
git tree: upstream

kernel config: https://syzkaller.appspot.com/x/.config?x=2cbd298d0aff1140
dashboard link: https://syzkaller.appspot.com/bug?extid=7fbdbd17a5bd6d01bc65

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13a58757280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=134a0f1f280000

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

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

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[syzbot]

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