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: KASAN: use-after-free Read 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: WARNING: ODEBUG bug in route4_delete_filter_work run #5: crashed: WARNING: ODEBUG bug in route4_destroy run #6: crashed: WARNING: ODEBUG bug in route4_delete_filter_work run #7: crashed: KASAN: use-after-free Read in route4_destroy run #8: crashed: WARNING: ODEBUG bug in route4_destroy run #9: crashed: KASAN: use-after-free Read in route4_destroy run #10: crashed: KASAN: use-after-free Read in route4_destroy run #11: crashed: KASAN: use-after-free Read 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: WARNING: ODEBUG bug in route4_destroy run #15: crashed: WARNING: ODEBUG bug in route4_destroy run #16: crashed: WARNING: ODEBUG bug in route4_destroy run #17: crashed: KASAN: use-after-free Read in route4_destroy run #18: crashed: KASAN: use-after-free Read in route4_destroy run #19: crashed: KASAN: use-after-free Read in route4_destroy testing current HEAD 6b278c0cb378079f3c0c61ae4a369c09ff1a4188 testing commit 6b278c0cb378079f3c0c61ae4a369c09ff1a4188 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 738a7354dbffdceb0250d421ed428ae91bd4d2b612e2170d72d719b6de787388 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: WARNING: ODEBUG bug in route4_destroy run #4: crashed: KASAN: use-after-free Read in route4_destroy run #5: crashed: KASAN: use-after-free Read in route4_destroy run #6: crashed: KASAN: use-after-free Read in route4_destroy run #7: crashed: KASAN: use-after-free Read in route4_destroy run #8: crashed: KASAN: use-after-free Read in route4_destroy run #9: crashed: KASAN: use-after-free Read in route4_destroy revisions tested: 2, total time: 20m48.985753184s (build: 13m21.849520176s, test: 6m49.617137589s) the crash still happens on HEAD commit msg: ibmvnic: delay complete() crash: KASAN: use-after-free Read in route4_destroy ================================================================== BUG: KASAN: use-after-free in route4_destroy+0x4fc/0x7d0 net/sched/cls_route.c:295 Read of size 8 at addr ffff88801dbea000 by task syz-executor.3/9192 CPU: 0 PID: 9192 Comm: syz-executor.3 Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 route4_destroy+0x4fc/0x7d0 net/sched/cls_route.c:295 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 notify_and_destroy net/sched/sch_api.c:1012 [inline] qdisc_graft+0xa5e/0x1030 net/sched/sch_api.c:1084 tc_modify_qdisc+0x949/0x16c0 net/sched/sch_api.c:1680 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2510 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x706/0xbf0 net/netlink/af_netlink.c:1935 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:00007f856a0fa188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcba2340af R14: 00007f856a0fa300 R15: 0000000000022000 Allocated by task 9174: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] route4_change+0x244/0x1ef0 net/sched/cls_route.c:493 tc_new_tfilter+0x811/0x1f00 net/sched/cls_api.c:2122 rtnetlink_rcv_msg+0x600/0x8d0 net/core/rtnetlink.c:5563 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2510 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x706/0xbf0 net/netlink/af_netlink.c:1935 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 Freed by task 8: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1726 slab_free mm/slub.c:3492 [inline] kfree+0xf3/0x550 mm/slub.c:4552 __route4_delete_filter net/sched/cls_route.c:257 [inline] route4_delete_filter_work+0x71/0xa0 net/sched/cls_route.c:266 process_one_work+0x87f/0x1450 kernel/workqueue.c:2297 worker_thread+0x598/0x1040 kernel/workqueue.c:2444 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348 insert_work+0x42/0x300 kernel/workqueue.c:1353 __queue_work+0x4a5/0xc80 kernel/workqueue.c:1519 rcu_work_rcufn+0x3d/0x60 kernel/workqueue.c:1755 rcu_do_batch kernel/rcu/tree.c:2508 [inline] rcu_core+0x7ab/0x1470 kernel/rcu/tree.c:2743 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2987 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067 queue_rcu_work+0x51/0x60 kernel/workqueue.c:1775 route4_change+0x14dd/0x1ef0 net/sched/cls_route.c:550 tc_new_tfilter+0x811/0x1f00 net/sched/cls_api.c:2122 rtnetlink_rcv_msg+0x600/0x8d0 net/core/rtnetlink.c:5563 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2510 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x706/0xbf0 net/netlink/af_netlink.c:1935 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 The buggy address belongs to the object at ffff88801dbea000 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes inside of 192-byte region [ffff88801dbea000, ffff88801dbea0c0) The buggy address belongs to the page: page:ffffea000076fa80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1dbea flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000074a580 0000000700000007 ffff88800fc41a00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY), pid 7, ts 7383397406, free_ts 0 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa6f/0x2f50 mm/page_alloc.c:4153 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375 alloc_slab_page mm/slub.c:1770 [inline] allocate_slab mm/slub.c:1907 [inline] new_slab+0x319/0x490 mm/slub.c:1970 ___slab_alloc+0x952/0x1040 mm/slub.c:3001 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3088 slab_alloc_node mm/slub.c:3179 [inline] slab_alloc mm/slub.c:3221 [inline] __kmalloc+0x305/0x320 mm/slub.c:4396 kmalloc include/linux/slab.h:596 [inline] usb_alloc_urb+0x25/0x60 drivers/usb/core/urb.c:74 usb_internal_control_msg drivers/usb/core/message.c:95 [inline] usb_control_msg+0x1bd/0x460 drivers/usb/core/message.c:153 get_port_status drivers/usb/core/hub.c:580 [inline] hub_ext_port_status+0xf8/0x3c0 drivers/usb/core/hub.c:597 hub_port_status drivers/usb/core/hub.c:619 [inline] hub_activate+0x3ae/0x1510 drivers/usb/core/hub.c:1126 process_one_work+0x87f/0x1450 kernel/workqueue.c:2297 worker_thread+0x598/0x1040 kernel/workqueue.c:2444 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page_owner free stack trace missing Memory state around the buggy address: ffff88801dbe9f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff88801dbe9f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801dbea000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801dbea080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801dbea100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================