bisecting fixing commit since 9f31eb60d7a23536bf3902d4dc602f10c822b79e building syzkaller on 34bf9440bd06034f86b5d9ac8afbf078129cbdae testing commit 9f31eb60d7a23536bf3902d4dc602f10c822b79e with gcc (GCC) 8.1.0 kernel signature: 5100ace6ac47be171a7b6aff3dbf764f7bb506e5c9fb49d4f2ecbe29c761d4cf 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: general protection fault in scatterwalk_copychunks run #3: crashed: general protection fault in scatterwalk_copychunks run #4: crashed: general protection fault in scatterwalk_copychunks run #5: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #6: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #7: crashed: general protection fault in corrupted 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 0c88e405c97ed1828443b67891e6d4bb6e56cd4e testing commit 0c88e405c97ed1828443b67891e6d4bb6e56cd4e with gcc (GCC) 8.1.0 kernel signature: 9f88459040a3eb55e78822070805ed0088a635ff65baa3e4056b7d07215fbc48 run #0: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #1: crashed: general protection fault in scatterwalk_copychunks run #2: crashed: general protection fault in corrupted run #3: crashed: general protection fault in scatterwalk_copychunks run #4: crashed: general protection fault in scatterwalk_copychunks run #5: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #6: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks run #7: crashed: general protection fault in scatterwalk_copychunks run #8: crashed: general protection fault in scatterwalk_copychunks run #9: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks revisions tested: 2, total time: 26m11.617987099s (build: 20m2.887840773s, test: 5m23.237377398s) the crash still happens on HEAD commit msg: Linux 4.19.160 crash: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks RBP: 000000000075bf20 R08: 0000000100000300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f466730e6d4 R13: 00000000004c887b R14: 00000000004de6b0 R15: 0000000000000005 ================================================================== IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready 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 IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready Read of size 4094 at addr ffff8881e6a09000 by task syz-executor.4/6581 CPU: 0 PID: 6581 Comm: syz-executor.4 Not tainted 4.19.160-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 IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready gcmaes_encrypt.constprop.15+0x6d6/0xda0 arch/x86/crypto/aesni-intel_glue.c:956 IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth0_to_hsr: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready generic_gcmaes_encrypt+0xfd/0x150 arch/x86/crypto/aesni-intel_glue.c:1297 hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network 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 hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network 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 IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready __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 8021q: adding VLAN 0 to HW filter on device batadv0 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:00007f466730dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f466730dc90 RCX: 0000000000459349 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000100000300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f466730e6d4 R13: 00000000004c887b R14: 00000000004de6b0 R15: 0000000000000005 Allocated by task 3402: 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 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3559 shmem_alloc_inode+0x15/0x30 mm/shmem.c:3599 alloc_inode+0x56/0x150 fs/inode.c:211 new_inode_pseudo+0xc/0xd0 fs/inode.c:911 new_inode+0x14/0x30 fs/inode.c:940 shmem_get_inode+0x67/0x740 mm/shmem.c:2196 shmem_mknod+0x49/0x1a0 mm/shmem.c:2833 shmem_create+0x13/0x20 mm/shmem.c:2893 lookup_open+0x102b/0x1d30 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0xf40/0x3c60 fs/namei.c:3537 do_filp_open+0x177/0x250 fs/namei.c:3567 do_sys_open+0x1dd/0x350 fs/open.c:1085 __do_sys_open fs/open.c:1103 [inline] __se_sys_open fs/open.c:1098 [inline] __x64_sys_open+0x79/0xb0 fs/open.c:1098 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8881e6a09000 which belongs to the cache shmem_inode_cache of size 1200 The buggy address is located 0 bytes inside of 1200-byte region [ffff8881e6a09000, ffff8881e6a094b0) The buggy address belongs to the page: page:ffffea00079a8240 count:1 mapcount:0 mapping:ffff8881f55e87c0 index:0xffff8881e6a09ffd flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00079eaf08 ffffea0007a0e0c8 ffff8881f55e87c0 raw: ffff8881e6a09ffd ffff8881e6a09000 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881e6a09380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881e6a09400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881e6a09480: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8881e6a09500: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 ffff8881e6a09580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================