bisecting fixing commit since 3f667b5d4053ad54aee13dab5c94f04ff75ddfdf building syzkaller on 44068e196185e2f5a7c94629b6245cdde008b140 testing commit 3f667b5d4053ad54aee13dab5c94f04ff75ddfdf compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 7602b70fbb89813a228ca0cd81c4ac0495ec6965b0162072797bd961447e4cb2 all runs: crashed: KASAN: slab-out-of-bounds Read in __htab_map_lookup_and_delete_batch testing current HEAD ef1302160bfb19f804451d0e919266703501c875 testing commit ef1302160bfb19f804451d0e919266703501c875 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: ff8085e82317a1a9b60dfe6dac1ebb4a64c69e1cae3b62ec79b0acff18981b9e all runs: crashed: KASAN: slab-out-of-bounds Read in __htab_map_lookup_and_delete_batch revisions tested: 2, total time: 19m43.084540318s (build: 12m21.19885584s, test: 6m28.83135169s) the crash still happens on HEAD commit msg: Merge tag 'sound-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound crash: KASAN: slab-out-of-bounds Read in __htab_map_lookup_and_delete_batch ================================================================== BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user include/linux/instrumented.h:118 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_user lib/usercopy.c:32 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x9c/0xc0 lib/usercopy.c:26 Read of size 42 at addr ffff88807e58c180 by task syz-executor.0/4317 CPU: 1 PID: 4317 Comm: syz-executor.0 Not tainted 5.18.0-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+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_copy_to_user include/linux/instrumented.h:118 [inline] _copy_to_user lib/usercopy.c:32 [inline] _copy_to_user+0x9c/0xc0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:160 [inline] __htab_map_lookup_and_delete_batch+0xb54/0x13f0 kernel/bpf/hashtab.c:1768 bpf_map_do_batch+0x1ef/0x420 kernel/bpf/syscall.c:4241 __sys_bpf+0x1717/0x4360 kernel/bpf/syscall.c:4723 __do_sys_bpf kernel/bpf/syscall.c:4767 [inline] __se_sys_bpf kernel/bpf/syscall.c:4765 [inline] __x64_sys_bpf+0x70/0xb0 kernel/bpf/syscall.c:4765 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5d28e88e99 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:00007f5d285dd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f5d28f9c030 RCX: 00007f5d28e88e99 RDX: 0000000000000038 RSI: 0000000020000080 RDI: 0000000000000019 RBP: 00007f5d28ee2ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe5ca7cb3f R14: 00007f5d285dd300 R15: 0000000000022000 Allocated by task 4317: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kvmalloc include/linux/slab.h:731 [inline] kvmalloc_array include/linux/slab.h:749 [inline] __htab_map_lookup_and_delete_batch+0x468/0x13f0 kernel/bpf/hashtab.c:1647 bpf_map_do_batch+0x1ef/0x420 kernel/bpf/syscall.c:4241 __sys_bpf+0x1717/0x4360 kernel/bpf/syscall.c:4723 __do_sys_bpf kernel/bpf/syscall.c:4767 [inline] __se_sys_bpf kernel/bpf/syscall.c:4765 [inline] __x64_sys_bpf+0x70/0xb0 kernel/bpf/syscall.c:4765 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88807e58c180 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff88807e58c180, ffff88807e58c1c0) The buggy address belongs to the physical page: page:ffffea0001f96300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e58c flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000001 ffff888010041640 raw: 0000000000000000 0000000080200020 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 4123, tgid 4123 (syz-executor.2), ts 60912266851, free_ts 60862464454 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0x178d/0x3dc0 mm/page_alloc.c:4182 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8e1/0xf20 mm/slub.c:3005 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] __kmalloc_track_caller+0x2e7/0x320 mm/slub.c:4916 kmemdup+0x1a/0x40 mm/util.c:128 kmemdup include/linux/fortify-string.h:440 [inline] sctp_addr_wq_mgmt+0x315/0x800 net/sctp/protocol.c:751 sctp_inet6addr_event+0x61d/0xb30 net/sctp/ipv6.c:94 notifier_call_chain+0x94/0x170 kernel/notifier.c:84 atomic_notifier_call_chain+0x54/0xf0 kernel/notifier.c:199 ipv6_add_addr+0x1022/0x1de0 net/ipv6/addrconf.c:1158 addrconf_add_linklocal+0x19d/0x480 net/ipv6/addrconf.c:3208 addrconf_addr_gen+0x2c2/0x320 net/ipv6/addrconf.c:3339 addrconf_notify+0x9b4/0x15a0 net/ipv6/addrconf.c:3624 notifier_call_chain+0x94/0x170 kernel/notifier.c:84 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1356 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3328 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2523 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] kmem_cache_alloc_node+0x255/0x3f0 mm/slub.c:3267 __alloc_skb+0x151/0x270 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1300 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_ifa+0x142/0x220 net/ipv4/devinet.c:1908 __inet_insert_ifa+0x75c/0xa60 net/ipv4/devinet.c:555 inet_rtm_newaddr+0x62a/0x800 net/ipv4/devinet.c:962 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5993 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x770/0xc20 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 Memory state around the buggy address: ffff88807e58c080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88807e58c100: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88807e58c180: 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807e58c200: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff88807e58c280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================