list_del corruption, ffff8801637c6ca8->next is LIST_POISON1 (dead000000000100) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:47! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 18119 Comm: syz-executor1 Not tainted 4.19.0-rc6+ #272 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45 Code: d7 fd 0f 0b 4c 89 e2 48 89 de 48 c7 c7 40 92 40 88 e8 7a a2 d7 fd 0f 0b 4c 89 ea 48 89 de 48 c7 c7 e0 91 40 88 e8 66 a2 d7 fd <0f> 0b 48 89 de 48 c7 c7 00 93 40 88 e8 55 a2 d7 fd 0f 0b 48 89 de RSP: 0018:ffff8801bc69f150 EFLAGS: 00010286 RAX: 000000000000004e RBX: ffff8801637c6ca8 RCX: ffffc9000409f000 RDX: 0000000000000000 RSI: ffffffff81650405 RDI: 0000000000000005 RBP: ffff8801bc69f168 R08: ffff8801c517a5c0 R09: ffffed003b5c4fe8 R10: ffffed003b5c4fe8 R11: ffff8801dae27f47 R12: dead000000000200 R13: dead000000000100 R14: ffff8801ce29c7c0 R15: dffffc0000000000 FS: 00007faa74b28700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002025c000 CR3: 00000001bfade000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] p9_fd_cancelled+0x80/0x2f0 net/9p/trans_fd.c:712 p9_client_flush+0x255/0x2a0 net/9p/client.c:691 p9_client_rpc+0x1284/0x1480 net/9p/client.c:800 p9_client_version net/9p/client.c:971 [inline] p9_client_create+0xc1b/0x160a net/9p/client.c:1058 v9fs_session_init+0x217/0x1a70 fs/9p/v9fs.c:400 v9fs_mount+0x7d/0x8f0 fs/9p/vfs_super.c:135 mount_fs+0xae/0x31d fs/super.c:1261 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2457 [inline] do_mount+0x581/0x31f0 fs/namespace.c:2787 ksys_mount+0x12d/0x140 fs/namespace.c:3003 __do_sys_mount fs/namespace.c:3017 [inline] __se_sys_mount fs/namespace.c:3014 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3014 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007faa74b27c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457579 RDX: 0000000020000900 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000072bfa0 R08: 0000000020000840 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007faa74b286d4 R13: 00000000004c28b5 R14: 00000000004d3c90 R15: 00000000ffffffff Modules linked in: ---[ end trace da252ef0eb644c0d ]--- RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45 Code: d7 fd 0f 0b 4c 89 e2 48 89 de 48 c7 c7 40 92 40 88 e8 7a a2 d7 fd 0f 0b 4c 89 ea 48 89 de 48 c7 c7 e0 91 40 88 e8 66 a2 d7 fd <0f> 0b 48 89 de 48 c7 c7 00 93 40 88 e8 55 a2 d7 fd 0f 0b 48 89 de RSP: 0018:ffff8801bc69f150 EFLAGS: 00010286 RAX: 000000000000004e RBX: ffff8801637c6ca8 RCX: ffffc9000409f000 RDX: 0000000000000000 RSI: ffffffff81650405 RDI: 0000000000000005 RBP: ffff8801bc69f168 R08: ffff8801c517a5c0 R09: ffffed003b5c4fe8 R10: ffffed003b5c4fe8 R11: ffff8801dae27f47 R12: dead000000000200 R13: dead000000000100 R14: ffff8801ce29c7c0 R15: dffffc0000000000 FS: 00007faa74b28700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002025c000 CR3: 00000001bfade000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400