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Message-ID: <67137e18.050a0220.1e4b4d.0025.GAE@google.com> Date: Sat, 19 Oct 2024 02:38:32 -0700 From: syzbot <syzbot+6cecd33924c207032259@...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 v9fs_session_init Hello, syzbot found the following issue on: HEAD commit: eca631b8fe80 Merge tag 'f2fs-6.12-rc4' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17b2c030580000 kernel config: https://syzkaller.appspot.com/x/.config?x=64667415a04ab9c4 dashboard link: https://syzkaller.appspot.com/bug?extid=6cecd33924c207032259 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-eca631b8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b977614f67ec/vmlinux-eca631b8.xz kernel image: https://storage.googleapis.com/syzbot-assets/72397bc76f94/bzImage-eca631b8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6cecd33924c207032259@...kaller.appspotmail.com ------------[ cut here ]------------ kmem_cache of name '9p-fcall-cache' already exists WARNING: CPU: 0 PID: 6253 at mm/slab_common.c:107 kmem_cache_sanity_check mm/slab_common.c:107 [inline] WARNING: CPU: 0 PID: 6253 at mm/slab_common.c:107 __kmem_cache_create_args+0xb0/0x3c0 mm/slab_common.c:294 Modules linked in: CPU: 0 UID: 0 PID: 6253 Comm: syz.3.288 Not tainted 6.12.0-rc3-syzkaller-00013-geca631b8fe80 #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 10 bb f1 8d 74 25 48 8b 7b 60 48 89 ee e8 b5 98 34 09 85 c0 75 e0 90 48 c7 c7 68 20 58 8d 48 89 ee e8 31 b1 7e ff 90 <0f> 0b 90 90 be 20 00 00 00 48 89 ef e8 3f 9a 34 09 48 85 c0 0f 85 RSP: 0018:ffffc900033e78f0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8880481808c0 RCX: ffffc9002447c000 RDX: 0000000000040000 RSI: ffffffff814e38c6 RDI: 0000000000000001 RBP: ffffffff8ca1dfe0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000001000 R14: ffffc900033e79e0 R15: 0000000000020018 FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:00000000f5696b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020001740 CR3: 0000000063442000 CR4: 0000000000352ef0 Call Trace: <TASK> 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: 0023:0xf7f17579 CPU: 0 UID: 0 PID: 6253 Comm: syz.3.288 Not tainted 6.12.0-rc3-syzkaller-00013-geca631b8fe80 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x3d/0x1f0 lib/dump_stack.c:120 panic+0x71d/0x800 kernel/panic.c:354 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 10 bb f1 8d 74 25 48 8b 7b 60 48 89 ee e8 b5 98 34 09 85 c0 75 e0 90 48 c7 c7 68 20 58 8d 48 89 ee e8 31 b1 7e ff 90 <0f> 0b 90 90 be 20 00 00 00 48 89 ef e8 3f 9a 34 09 48 85 c0 0f 85 RSP: 0018:ffffc900033e78f0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8880481808c0 RCX: ffffc9002447c000 RDX: 0000000000040000 RSI: ffffffff814e38c6 RDI: 0000000000000001 RBP: ffffffff8ca1dfe0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000001000 R14: ffffc900033e79e0 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: 0023:0xf7f17579 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:00000000f569656c EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000020000180 RDX: 0000000020000200 RSI: 0000000000000000 RDI: 0000000020000280 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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