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Message-ID: <66fc6540.050a0220.f28ec.04d2.GAE@google.com> Date: Tue, 01 Oct 2024 14:10:24 -0700 From: syzbot <syzbot+03231aee4187c1602cba@...kaller.appspotmail.com> To: asmadeus@...ewreck.org, ericvh@...nel.org, linux-kernel@...r.kernel.org, linux_oss@...debyte.com, lucho@...kov.net, syzkaller-bugs@...glegroups.com, v9fs@...ts.linux.dev Subject: [syzbot] [v9fs?] WARNING in legacy_get_tree 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@...kaller.appspotmail.com 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 --- 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 syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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
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