bisecting fixing commit since 9f31eb60d7a23536bf3902d4dc602f10c822b79e building syzkaller on 34bf9440bd06034f86b5d9ac8afbf078129cbdae testing commit 9f31eb60d7a23536bf3902d4dc602f10c822b79e with gcc (GCC) 8.1.0 kernel signature: db25b569b8f1b8b6fc55f1c8e8473ca20cd0711c7f41306179936999e9a5e5f5 run #0: crashed: general protection fault in scatterwalk_copychunks run #1: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #2: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #3: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #4: crashed: general protection fault in scatterwalk_copychunks run #5: crashed: general protection fault in scatterwalk_copychunks run #6: crashed: general protection fault in scatterwalk_copychunks run #7: crashed: general protection fault in scatterwalk_copychunks run #8: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #9: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks testing current HEAD 20b3a3dfdf6c55b50bbdc8e231a3dbf6bf965dc7 testing commit 20b3a3dfdf6c55b50bbdc8e231a3dbf6bf965dc7 with gcc (GCC) 8.1.0 kernel signature: ca515f56305f9195cc044b97d27af3265bf5571a197bcf885c2dcae033034151 run #0: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #1: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #2: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #3: crashed: general protection fault in corrupted run #4: crashed: general protection fault in scatterwalk_copychunks run #5: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #6: crashed: general protection fault in scatterwalk_copychunks run #7: crashed: general protection fault in scatterwalk_copychunks run #8: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #9: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks revisions tested: 2, total time: 26m0.203721056s (build: 18m34.674288856s, test: 6m1.509034616s) the crash still happens on HEAD commit msg: Linux 4.19.134 crash: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x123/0x177 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0x5/0x13 lib/fault-inject.c:149 ================================================================== __should_failslab+0xba/0xf0 mm/failslab.c:32 BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:373 [inline] BUG: KASAN: slab-out-of-bounds in memcpy_dir crypto/scatterwalk.c:28 [inline] BUG: KASAN: slab-out-of-bounds in scatterwalk_copychunks+0x1e1/0x610 crypto/scatterwalk.c:43 should_failslab+0x9/0x14 mm/slab_common.c:1558 Read of size 4094 at addr ffff888097bfc000 by task syz-executor.1/7150 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x2dd/0x770 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] aead_request_alloc include/crypto/aead.h:425 [inline] tls_push_record+0xff/0x1600 net/tls/tls_sw.c:209 tls_sw_sendpage+0x458/0xc00 net/tls/tls_sw.c:585 inet_sendpage+0x122/0x600 net/ipv4/af_inet.c:815 kernel_sendpage+0x60/0xd0 net/socket.c:3378 sock_sendpage+0x6d/0xd0 net/socket.c:847 pipe_to_sendpage+0x212/0x430 fs/splice.c:452 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x2cb/0x720 fs/splice.c:627 splice_from_pipe+0xbb/0x120 fs/splice.c:662 generic_splice_sendpage+0x10/0x20 fs/splice.c:833 do_splice_from fs/splice.c:852 [inline] do_splice+0x4fd/0x12d0 fs/splice.c:1154 __do_sys_splice fs/splice.c:1428 [inline] __se_sys_splice fs/splice.c:1408 [inline] __x64_sys_splice+0x248/0x300 fs/splice.c:1408 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: 7d b7 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 4b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f41b42bdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f41b42bdc90 RCX: 0000000000459349 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000100000300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f41b42be6d4 R13: 00000000004c887b R14: 00000000004de6b0 R15: 0000000000000005 CPU: 0 PID: 7150 Comm: syz-executor.1 Not tainted 4.19.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x123/0x177 lib/dump_stack.c:118 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:373 [inline] memcpy_dir crypto/scatterwalk.c:28 [inline] scatterwalk_copychunks+0x1e1/0x610 crypto/scatterwalk.c:43 scatterwalk_map_and_copy+0x128/0x190 crypto/scatterwalk.c:72 gcmaes_encrypt.constprop.15+0x6d6/0xda0 arch/x86/crypto/aesni-intel_glue.c:956 generic_gcmaes_encrypt+0xfd/0x150 arch/x86/crypto/aesni-intel_glue.c:1297 crypto_aead_encrypt include/crypto/aead.h:335 [inline] gcmaes_wrapper_encrypt+0x109/0x180 arch/x86/crypto/aesni-intel_glue.c:1130 crypto_aead_encrypt include/crypto/aead.h:335 [inline] tls_do_encryption net/tls/tls_sw.c:193 [inline] tls_push_record+0x9ae/0x1600 net/tls/tls_sw.c:228 tls_sw_sendpage+0x458/0xc00 net/tls/tls_sw.c:585 inet_sendpage+0x122/0x600 net/ipv4/af_inet.c:815 kernel_sendpage+0x60/0xd0 net/socket.c:3378 sock_sendpage+0x6d/0xd0 net/socket.c:847 pipe_to_sendpage+0x212/0x430 fs/splice.c:452 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x2cb/0x720 fs/splice.c:627 splice_from_pipe+0xbb/0x120 fs/splice.c:662 generic_splice_sendpage+0x10/0x20 fs/splice.c:833 do_splice_from fs/splice.c:852 [inline] do_splice+0x4fd/0x12d0 fs/splice.c:1154 __do_sys_splice fs/splice.c:1428 [inline] __se_sys_splice fs/splice.c:1408 [inline] __x64_sys_splice+0x248/0x300 fs/splice.c:1408 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459349 Code: 7d b7 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 4b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f60c9b78c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f60c9b78c90 RCX: 0000000000459349 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000100000300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f60c9b796d4 R13: 00000000004c887b R14: 00000000004de6b0 R15: 0000000000000005 Allocated by task 6263: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node_track_caller+0x50/0x70 mm/slab.c:3703 __kmalloc_reserve.isra.39+0x2c/0xc0 net/core/skbuff.c:137 __alloc_skb+0xd7/0x580 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] nlmsg_new include/net/netlink.h:511 [inline] rtmsg_ifinfo_build_skb+0x6f/0x170 net/core/rtnetlink.c:3352 rtmsg_ifinfo_event.part.32+0x1a/0xb0 net/core/rtnetlink.c:3388 rtmsg_ifinfo_event net/core/rtnetlink.c:3399 [inline] rtmsg_ifinfo+0x4e/0x70 net/core/rtnetlink.c:3397 __dev_notify_flags+0x1a1/0x240 net/core/dev.c:7704 dev_change_flags+0xe6/0x150 net/core/dev.c:7744 do_setlink+0x1173/0x2d20 net/core/rtnetlink.c:2449 rtnl_newlink+0xa1d/0x1320 net/core/rtnetlink.c:3077 rtnetlink_rcv_msg+0x34f/0x8f0 net/core/rtnetlink.c:4777 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2455 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4795 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x445/0x640 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x765/0xc50 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 6263: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 skb_free_head+0x74/0x90 net/core/skbuff.c:554 pskb_expand_head+0x27a/0xd80 net/core/skbuff.c:1497 netlink_trim+0x1a7/0x200 net/netlink/af_netlink.c:1300 netlink_broadcast_filtered+0x57/0x930 net/netlink/af_netlink.c:1497 netlink_broadcast net/netlink/af_netlink.c:1542 [inline] nlmsg_multicast include/net/netlink.h:591 [inline] nlmsg_notify+0x6b/0x120 net/netlink/af_netlink.c:2498 rtnl_notify net/core/rtnetlink.c:736 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3376 [inline] rtmsg_ifinfo_event.part.32+0x7f/0xb0 net/core/rtnetlink.c:3391 rtmsg_ifinfo_event net/core/rtnetlink.c:3399 [inline] rtmsg_ifinfo+0x4e/0x70 net/core/rtnetlink.c:3397 __dev_notify_flags+0x1a1/0x240 net/core/dev.c:7704 dev_change_flags+0xe6/0x150 net/core/dev.c:7744 do_setlink+0x1173/0x2d20 net/core/rtnetlink.c:2449 rtnl_newlink+0xa1d/0x1320 net/core/rtnetlink.c:3077 rtnetlink_rcv_msg+0x34f/0x8f0 net/core/rtnetlink.c:4777 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2455 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4795 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x445/0x640 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x765/0xc50 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888097bfc380 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 896 bytes to the left of 4096-byte region [ffff888097bfc380, ffff888097bfd380) The buggy address belongs to the page: page:ffffea00025eff00 count:1 mapcount:0 mapping:ffff88812c31edc0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000008100(slab|head) raw: 01fffc0000008100 ffffea000260e988 ffffea00025d4a88 ffff88812c31edc0 raw: 0000000000000000 ffff888097bfc380 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888097bfbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888097bfbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888097bfc000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888097bfc080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888097bfc100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================