bisecting fixing commit since 9f84340f012ee60c12aacc03662bcdd67419a31a building syzkaller on 55aa55c24fe77aae07d530662f91b4d50c4990f0 testing commit 9f84340f012ee60c12aacc03662bcdd67419a31a compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 12b7b7596dead2d9227f3c7fbaefccab46a17338b9e54dd9e7f1dd3f7573ae2d run #0: crashed: BUG: corrupted list in remove_wait_queue run #1: crashed: BUG: corrupted list in remove_wait_queue run #2: crashed: BUG: corrupted list in remove_wait_queue run #3: crashed: BUG: corrupted list in remove_wait_queue run #4: crashed: BUG: corrupted list in corrupted run #5: crashed: BUG: corrupted list in remove_wait_queue run #6: crashed: BUG: corrupted list in remove_wait_queue run #7: crashed: BUG: corrupted list in remove_wait_queue run #8: crashed: BUG: corrupted list in remove_wait_queue run #9: crashed: BUG: corrupted list in remove_wait_queue run #10: crashed: BUG: corrupted list in remove_wait_queue run #11: crashed: BUG: corrupted list in remove_wait_queue run #12: crashed: BUG: corrupted list in remove_wait_queue run #13: crashed: BUG: corrupted list in corrupted run #14: crashed: BUG: corrupted list in remove_wait_queue run #15: crashed: BUG: corrupted list in remove_wait_queue run #16: crashed: BUG: corrupted list in remove_wait_queue run #17: crashed: BUG: corrupted list in remove_wait_queue run #18: crashed: BUG: corrupted list in corrupted run #19: crashed: BUG: corrupted list in remove_wait_queue testing current HEAD c2276d585654e8d573366c29c565043ec36adf63 testing commit c2276d585654e8d573366c29c565043ec36adf63 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 111d5b14219bf504b31e6f5f702006ce1ec7599480ba8962e296e7ed5eb7d69c run #0: crashed: BUG: corrupted list in corrupted run #1: crashed: BUG: corrupted list in corrupted run #2: crashed: BUG: corrupted list in remove_wait_queue run #3: crashed: BUG: corrupted list in remove_wait_queue run #4: crashed: BUG: corrupted list in remove_wait_queue run #5: crashed: BUG: corrupted list in remove_wait_queue run #6: crashed: BUG: corrupted list in remove_wait_queue run #7: crashed: BUG: corrupted list in remove_wait_queue run #8: crashed: BUG: corrupted list in remove_wait_queue run #9: crashed: BUG: corrupted list in corrupted revisions tested: 2, total time: 28m7.166428493s (build: 20m58.548821179s, test: 6m31.564547674s) the crash still happens on HEAD commit msg: Linux 4.19.208 crash: BUG: corrupted list in corrupted wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready list_del corruption, ffff8880b4eb7640->next is LIST_POISON1 (dead000000000100) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:47! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 9884 Comm: syz-executor.0 Not tainted 4.19.208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x4a lib/list_debug.c:45 Code: f7 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 a0 27 50 88 e8 5b fb f7 ff 0f 0b 4c 89 ea 48 89 de 48 c7 c7 40 27 50 88 e8 47 fb f7 ff <0f> 0b 48 89 de 48 c7 c7 60 28 50 88 e8 36 fb f7 ff 0f 0b 48 89 de RSP: 0018:ffff8880b4eb74d0 EFLAGS: 00010086 RAX: 000000000000004e RBX: ffff8880b4eb7640 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff885024a0 RDI: ffffffff8bad9720 list_del corruption, ffff888097cbf640->next is LIST_POISON1 (dead000000000100) RBP: ffff8880b4eb74e8 R08: ffffed1017464ea9 R09: ffffed1017464ea8 ------------[ cut here ]------------ R10: ffffed1017464ea8 R11: ffff8880ba327547 R12: dead000000000200 kernel BUG at lib/list_debug.c:47! R13: dead000000000100 R14: ffff88809690b180 R15: ffff8880a84ae0c0 FS: 00007f97e5964700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005626790d3c20 CR3: 000000009de83000 CR4: 00000000003406e0 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] __remove_wait_queue include/linux/wait.h:184 [inline] remove_wait_queue+0x30/0x1b0 kernel/sched/wait.c:44 tipc_send_group_bcast+0x33a/0xa10 net/tipc/socket.c:1022 tipc_send_group_mcast net/tipc/socket.c:1109 [inline] __tipc_sendmsg+0x449/0x12c0 net/tipc/socket.c:1320 tipc_sendmsg+0x4b/0x70 net/tipc/socket.c:1279 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:661 ___sys_sendmsg+0x28e/0x950 net/socket.c:2227 __sys_sendmmsg+0x160/0x370 net/socket.c:2322 __do_sys_sendmmsg net/socket.c:2351 [inline] __se_sys_sendmmsg net/socket.c:2348 [inline] __x64_sys_sendmmsg+0x98/0x100 net/socket.c:2348 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f97e5964188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 080000000000010b RSI: 0000000020000a40 RDI: 0000000000000003 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffc59aa462f R14: 00007f97e5964300 R15: 0000000000022000 Modules linked in: ---[ end trace 11a6d053ef505724 ]--- invalid opcode: 0000 [#2] PREEMPT SMP KASAN RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x4a lib/list_debug.c:45 CPU: 0 PID: 9897 Comm: syz-executor.5 Tainted: G D 4.19.208-syzkaller #0 Code: f7 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 a0 27 50 88 e8 5b fb f7 ff 0f 0b 4c 89 ea 48 89 de 48 c7 c7 40 27 50 88 e8 47 fb f7 ff <0f> 0b 48 89 de 48 c7 c7 60 28 50 88 e8 36 fb f7 ff 0f 0b 48 89 de Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RSP: 0018:ffff8880b4eb74d0 EFLAGS: 00010086 RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x4a lib/list_debug.c:45 Code: f7 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 a0 27 50 88 e8 5b fb f7 ff 0f 0b 4c 89 ea 48 89 de 48 c7 c7 40 27 50 88 e8 47 fb f7 ff <0f> 0b 48 89 de 48 c7 c7 60 28 50 88 e8 36 fb f7 ff 0f 0b 48 89 de RAX: 000000000000004e RBX: ffff8880b4eb7640 RCX: 0000000000000000 RSP: 0018:ffff888097cbf4d0 EFLAGS: 00010086 RDX: 0000000000000000 RSI: ffffffff885024a0 RDI: ffffffff8bad9720 RAX: 000000000000004e RBX: ffff888097cbf640 RCX: 0000000000000001 RBP: ffff8880b4eb74e8 R08: ffffed1017464ea9 R09: ffffed1017464ea8 RDX: 0000000000000000 RSI: ffffffff885024a0 RDI: ffffffff8bad9720 R10: ffffed1017464ea8 R11: ffff8880ba327547 R12: dead000000000200 RBP: ffff888097cbf4e8 R08: ffffed1017444ea9 R09: ffffed1017444ea8 R13: dead000000000100 R14: ffff88809690b180 R15: ffff8880a84ae0c0 R10: ffffed1017444ea8 R11: ffff8880ba227547 R12: dead000000000200 FS: 00007f97e5964700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000 R13: dead000000000100 R14: ffff88809765f3c0 R15: ffff8880a84ae680 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 FS: 00007ff3e3e17700(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000 CR2: 00005626790d3c20 CR3: 000000009de83000 CR4: 00000000003406e0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 CR2: 00007ff3e3dd5718 CR3: 0000000097527000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400