[syzbot] [v9fs?] WARNING in legacy_get_tree

From: syzbot
Date: Tue Oct 01 2024 - 17:10:36 EST

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Hello,

syzbot found the following issue on:

HEAD commit: e477dba5442c Merge tag 'for-6.12/dm-changes' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14f77a80580000
kernel config: https://syzkaller.appspot.com/x/.config?x=35e823d88dbbbfe5
dashboard link: https://syzkaller.appspot.com/bug?extid=03231aee4187c1602cba
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-e477dba5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b9ec64056ebb/vmlinux-e477dba5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/87b5c9bcdaed/bzImage-e477dba5.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+03231aee4187c1602cba@xxxxxxxxxxxxxxxxxxxxxxxxx

kmem_cache of name '9p-fcall-cache' already exists
WARNING: CPU: 2 PID: 14626 at mm/slab_common.c:107 kmem_cache_sanity_check mm/slab_common.c:107 [inline]
WARNING: CPU: 2 PID: 14626 at mm/slab_common.c:107 __kmem_cache_create_args+0xb0/0x3c0 mm/slab_common.c:294
Modules linked in:
CPU: 2 UID: 0 PID: 14626 Comm: syz.1.2250 Not tainted 6.11.0-syzkaller-11624-ge477dba5442c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:kmem_cache_sanity_check mm/slab_common.c:107 [inline]
RIP: 0010:__kmem_cache_create_args+0xb0/0x3c0 mm/slab_common.c:294
Code: 98 48 3d d0 b7 f1 8d 74 25 48 8b 7b 60 48 89 ee e8 b5 06 33 09 85 c0 75 e0 90 48 c7 c7 30 f7 57 8d 48 89 ee e8 b1 cc 7e ff 90 <0f> 0b 90 90 be 20 00 00 00 48 89 ef e8 3f 08 33 09 48 85 c0 0f 85
RSP: 0018:ffffc90002b0f8f0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888049cdb540 RCX: ffffc9002363b000
RDX: 0000000000040000 RSI: ffffffff814dc916 RDI: 0000000000000001
RBP: ffffffff8ca1d8e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000020018 R14: ffffc90002b0f9e0 R15: 0000000000020018
FS: 0000000000000000(0000) GS:ffff88802b600000(0063) knlGS:00000000f5716b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f73dbc38 CR3: 0000000000282000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000047d
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1800
do_new_mount fs/namespace.c:3507 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3834
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf742e579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f571656c EFLAGS: 00000296 ORIG_RAX: 0000000000000015
CPU: 2 UID: 0 PID: 14626 Comm: syz.1.2250 Not tainted 6.11.0-syzkaller-11624-ge477dba5442c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
<TASK>
check_panic_on_warn+0xab/0xb0 kernel/panic.c:243
__warn+0xf6/0x3d0 kernel/panic.c:748
__report_bug lib/bug.c:199 [inline]
report_bug+0x3c0/0x580 lib/bug.c:219
handle_bug+0x54/0xa0 arch/x86/kernel/traps.c:285
exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:309
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0010:kmem_cache_sanity_check mm/slab_common.c:107 [inline]
RIP: 0010:__kmem_cache_create_args+0xb0/0x3c0 mm/slab_common.c:294
Code: 98 48 3d d0 b7 f1 8d 74 25 48 8b 7b 60 48 89 ee e8 b5 06 33 09 85 c0 75 e0 90 48 c7 c7 30 f7 57 8d 48 89 ee e8 b1 cc 7e ff 90 <0f> 0b 90 90 be 20 00 00 00 48 89 ef e8 3f 08 33 09 48 85 c0 0f 85
RSP: 0018:ffffc90002b0f8f0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888049cdb540 RCX: ffffc9002363b000
RDX: 0000000000040000 RSI: ffffffff814dc916 RDI: 0000000000000001
RBP: ffffffff8ca1d8e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000020018 R14: ffffc90002b0f9e0 R15: 0000000000020018
kmem_cache_create_usercopy include/linux/slab.h:361 [inline]
p9_client_create+0xe04/0x1150 net/9p/client.c:1042
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xa50 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1800
do_new_mount fs/namespace.c:3507 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3834
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4055 [inline]
__se_sys_mount fs/namespace.c:4032 [inline]
__ia32_sys_mount+0x292/0x310 fs/namespace.c:4032
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf742e579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f571656c EFLAGS: 00000296 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000200001c0 RCX: 0000000020000480
RDX: 00000000200004c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi

---
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Next message: Kairui Song: "Re: Known and unfixed active data loss bug in MM + XFS with large folios since Dec 2021 (any kernel from 6.1 upwards)"
Previous message: syzbot: "[syzbot] [v9fs?] WARNING in v9fs_mount"
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