bisecting fixing commit since 57f780f1c43362b86fd23d20bd940e2468237716 building syzkaller on 15cea0a381c6ef9a7b4ffb2770360ce8882274c5 testing commit 57f780f1c43362b86fd23d20bd940e2468237716 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 93ad05cc496500a9477f7a1420811f392de6bc7ecfc10bdbae08232d4b374a3d run #0: crashed: KASAN: use-after-free Read in route4_destroy run #1: crashed: WARNING: ODEBUG bug in route4_destroy run #2: crashed: WARNING: ODEBUG bug in route4_destroy run #3: crashed: KASAN: use-after-free Read in route4_destroy run #4: crashed: KASAN: use-after-free Read in route4_destroy run #5: crashed: WARNING: ODEBUG bug in route4_destroy run #6: crashed: WARNING: ODEBUG bug in route4_destroy run #7: crashed: KASAN: use-after-free Read in route4_get run #8: crashed: KASAN: use-after-free Read in route4_destroy run #9: crashed: WARNING: ODEBUG bug in route4_destroy run #10: crashed: WARNING: ODEBUG bug in route4_destroy run #11: crashed: WARNING: ODEBUG bug in route4_destroy run #12: crashed: KASAN: use-after-free Read in route4_destroy run #13: crashed: KASAN: use-after-free Read in route4_destroy run #14: crashed: KASAN: use-after-free Read in route4_get run #15: crashed: KASAN: use-after-free Read in route4_destroy run #16: crashed: KASAN: use-after-free Read in route4_destroy run #17: crashed: WARNING: ODEBUG bug in route4_destroy run #18: crashed: WARNING: ODEBUG bug in route4_destroy run #19: crashed: WARNING: ODEBUG bug in route4_destroy testing current HEAD 7cd8b1542a7ba0720c5a0a85ed414a122015228b testing commit 7cd8b1542a7ba0720c5a0a85ed414a122015228b compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: f4e43c379d667b2907496fef8f4895ec4ab5877edaa2b066499a3180b611b016 run #0: crashed: WARNING: ODEBUG bug in route4_destroy run #1: crashed: WARNING: ODEBUG bug in route4_destroy run #2: crashed: KASAN: use-after-free Read in route4_destroy run #3: crashed: WARNING: ODEBUG bug in route4_destroy run #4: crashed: WARNING: ODEBUG bug in route4_destroy run #5: crashed: WARNING: ODEBUG bug in route4_destroy run #6: crashed: KASAN: use-after-free Read in route4_destroy run #7: crashed: WARNING: ODEBUG bug in route4_delete_filter_work run #8: crashed: WARNING: ODEBUG bug in route4_destroy run #9: crashed: WARNING: ODEBUG bug in route4_destroy revisions tested: 2, total time: 20m53.632920162s (build: 13m25.128567538s, test: 6m53.528374748s) the crash still happens on HEAD commit msg: ptp_pch: Load module automatically if ID matches crash: WARNING: ODEBUG bug in route4_destroy ------------[ cut here ]------------ ODEBUG: activate active (active state 1) object type: rcu_head hint: 0x0 WARNING: CPU: 1 PID: 9162 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Modules linked in: CPU: 1 PID: 9162 Comm: syz-executor.4 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd 40 94 20 89 4c 89 ee 48 c7 c7 40 88 20 89 e8 09 53 9e 04 <0f> 0b 83 05 05 5d f4 08 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffc9000d057090 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff89208420 RDI: fffff52001a0ae04 RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880b9f2bf87 R10: ffffed10173e57f0 R11: 203a47554245444f R12: ffffffff88cc9780 R13: ffffffff89208f00 R14: 0000000000000000 R15: ffffffff88cc9780 FS: 00007f6d10584700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f557818f018 CR3: 000000005ea30000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_object_activate+0x2da/0x3e0 lib/debugobjects.c:677 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] __call_rcu kernel/rcu/tree.c:2971 [inline] call_rcu+0x2c/0x750 kernel/rcu/tree.c:3067 queue_rcu_work+0x51/0x60 kernel/workqueue.c:1775 route4_queue_work net/sched/cls_route.c:272 [inline] route4_destroy+0x3b3/0x7d0 net/sched/cls_route.c:299 tcf_proto_destroy+0x63/0x2d0 net/sched/cls_api.c:297 tcf_chain_flush+0x1d7/0x2e0 net/sched/cls_api.c:615 tcf_block_flush_all_chains net/sched/cls_api.c:1017 [inline] __tcf_block_put+0x106/0x3f0 net/sched/cls_api.c:1179 tcf_block_put_ext net/sched/cls_api.c:1384 [inline] tcf_block_put_ext net/sched/cls_api.c:1376 [inline] tcf_block_put+0xcf/0x110 net/sched/cls_api.c:1394 drr_destroy_qdisc+0x3f/0x1a0 net/sched/sch_drr.c:458 qdisc_destroy+0xa5/0x390 net/sched/sch_generic.c:1025 tc_new_tfilter+0x934/0x1f00 net/sched/cls_api.c:2143 rtnetlink_rcv_msg+0x600/0x8d0 net/core/rtnetlink.c:5563 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x704/0xbf0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:724 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2409 ___sys_sendmsg+0xd3/0x150 net/socket.c:2463 __sys_sendmsg+0xb2/0x140 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 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:00007f6d10584188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056c1a8 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000007 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c1a8 R13: 00007ffcc996ce3f R14: 00007f6d10584300 R15: 0000000000022000