list_del corruption, ffff88801c50a0b0->next is LIST_POISON1 (dead000000000100) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:53! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 3 PID: 7642 Comm: syz-executor.3 Not tainted 6.0.0-rc4-syzkaller-00331-g4ed9c1e971b1 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:__list_del_entry_valid.cold+0x5c/0x72 lib/list_debug.c:53 Code: e8 01 f6 f0 ff 0f 0b 48 89 ee 48 c7 c7 a0 fb 48 8a e8 f0 f5 f0 ff 0f 0b 4c 89 ea 48 89 ee 48 c7 c7 60 fc 48 8a e8 dc f5 f0 ff <0f> 0b 4c 89 e9 48 89 ee 48 c7 c7 a0 fd 48 8a e8 c8 f5 f0 ff 0f 0b RSP: 0018:ffffc90003b276e8 EFLAGS: 00010282 RAX: 000000000000004e RBX: 0000000000000005 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff8161f408 RDI: fffff52000764ecf RBP: ffff88801c50a0b0 R08: 000000000000004e R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: dead000000000122 R13: dead000000000100 R14: ffff88801c50a0b8 R15: ffffffff89009280 FS: 0000000000000000(0000) GS:ffff88802cb00000(0063) knlGS:00000000f7ef9b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020b51000 CR3: 000000005b9f1000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:134 [inline] list_del include/linux/list.h:148 [inline] p9_fd_cancelled+0x71/0x230 net/9p/trans_fd.c:723 p9_client_flush+0x341/0x430 net/9p/client.c:587 p9_client_rpc+0xbce/0xce0 net/9p/client.c:694 p9_client_version net/9p/client.c:880 [inline] p9_client_create+0xaec/0x1070 net/9p/client.c:985 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __ia32_sys_mount+0x27e/0x300 fs/namespace.c:3568 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f40549 Code: 03 74 c0 01 10 05 03 74 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 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:00000000f7ef95cc EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000020000040 RDX: 0000000020000200 RSI: 0000000000000000 RDI: 00000000200003c0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_del_entry_valid.cold+0x5c/0x72 lib/list_debug.c:53 Code: e8 01 f6 f0 ff 0f 0b 48 89 ee 48 c7 c7 a0 fb 48 8a e8 f0 f5 f0 ff 0f 0b 4c 89 ea 48 89 ee 48 c7 c7 60 fc 48 8a e8 dc f5 f0 ff <0f> 0b 4c 89 e9 48 89 ee 48 c7 c7 a0 fd 48 8a e8 c8 f5 f0 ff 0f 0b RSP: 0018:ffffc90003b276e8 EFLAGS: 00010282 RAX: 000000000000004e RBX: 0000000000000005 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff8161f408 RDI: fffff52000764ecf RBP: ffff88801c50a0b0 R08: 000000000000004e R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: dead000000000122 R13: dead000000000100 R14: ffff88801c50a0b8 R15: ffffffff89009280 FS: 0000000000000000(0000) GS:ffff88802cb00000(0063) knlGS:00000000f7ef9b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020b51000 CR3: 000000005b9f1000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi