[syzbot] [f2fs?] general protection fault in f2fs_drop_extent_tree

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a92b7d26c743 Merge tag 'drm-fixes-2023-06-23' of git://ano..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=107e3e50a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=2cbd298d0aff1140
dashboard link: https://syzkaller.appspot.com/bug?extid=f4649be1be739e030111
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=1564afb0a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166928c7280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/53d1be238f30/disk-a92b7d26.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/04748ac79920/vmlinux-a92b7d26.xz
kernel image: https://storage.googleapis.com/syzbot-assets/78634d05a96b/bzImage-a92b7d26.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/dcc03ca9e012/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f4649b...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 0 PID: 5015 Comm: syz-executor425 Not tainted 6.4.0-rc7-syzkaller-00226-ga92b7d26c743 #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: 0018:ffffc90003b6f9d8 EFLAGS: 00010016
RAX: dffffc0000000000 RBX: 1ffff9200076df6c RCX: 0000000000000000
RDX: 0000000000000009 RSI: 0000000000000000 RDI: 0000000000000048
RBP: ffff88802834d940 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000048
R13: 0000000000000000 R14: 0000000000000048 R15: 0000000000000000
FS: 00007f2b8ef07700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2b8efac0c8 CR3: 00000000235f8000 CR4: 0000000000350ef0
Call Trace:
<TASK>
lock_acquire kernel/locking/lockdep.c:5705 [inline]
lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
__raw_write_lock include/linux/rwlock_api_smp.h:209 [inline]
_raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:300
__drop_extent_tree fs/f2fs/extent_cache.c:1100 [inline]
f2fs_drop_extent_tree+0xf0/0x3a0 fs/f2fs/extent_cache.c:1116
f2fs_insert_range fs/f2fs/file.c:1664 [inline]
f2fs_fallocate+0xce5/0x36d0 fs/f2fs/file.c:1838
vfs_fallocate+0x48b/0xe40 fs/open.c:324
ksys_fallocate fs/open.c:347 [inline]
__do_sys_fallocate fs/open.c:355 [inline]
__se_sys_fallocate fs/open.c:353 [inline]
__x64_sys_fallocate+0xd3/0x140 fs/open.c:353
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2b8ef5b459
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2b8ef072f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f2b8efe57a0 RCX: 00007f2b8ef5b459
RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000005
RBP: 00007f2b8efb27f8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 00007f2b8efb26c0
R13: 0030656c69662f2e R14: 4b55cd3db08b6c4e R15: 00007f2b8efe57a8
</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: 0018:ffffc90003b6f9d8 EFLAGS: 00010016
RAX: dffffc0000000000 RBX: 1ffff9200076df6c RCX: 0000000000000000
RDX: 0000000000000009 RSI: 0000000000000000 RDI: 0000000000000048
RBP: ffff88802834d940 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000048
R13: 0000000000000000 R14: 0000000000000048 R15: 0000000000000000
FS: 00007f2b8ef07700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2b8efac0c8 CR3: 00000000235f8000 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 458c15dfbce62c35fefd9ca637b20a051309c9f1
Author: Chao Yu <ch...@kernel.org>
Date: Tue May 23 03:58:22 2023 +0000

f2fs: don't reset unchangable mount option in f2fs_remount()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12461d31a80000
start commit: a92b7d26c743 Merge tag 'drm-fixes-2023-06-23' of git://ano..
git tree: upstream

kernel config: https://syzkaller.appspot.com/x/.config?x=2cbd298d0aff1140
dashboard link: https://syzkaller.appspot.com/bug?extid=f4649be1be739e030111

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1564afb0a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166928c7280000

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

#syz fix: f2fs: don't reset unchangable mount option in f2fs_remount()

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

[Aleksandr Nogikh]

Looks reasonable.