bisecting fixing commit since 555161ee1b7a74e77ca70fd14ed8a5137c8108ac
building syzkaller on 2e29b534005e52c57d726201644ea28ba33a9a3d
testing commit 555161ee1b7a74e77ca70fd14ed8a5137c8108ac with gcc (GCC) 8.4.1 20210217
kernel signature: 6d16430c87f4329cfdd9af743a19d89cdb1fac7ebf6f705be4265ba270b27c59
run #0: crashed: KASAN: use-after-free 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 scatterwalk_copychunks
run #4: crashed: general protection fault in scatterwalk_copychunks
run #5: crashed: general protection fault in scatterwalk_copychunks
run #6: crashed: KASAN: use-after-free Read in scatterwalk_copychunks
run #7: crashed: KASAN: slab-out-of-bounds Read 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
run #10: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #11: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #12: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #13: crashed: general protection fault in scatterwalk_copychunks
run #14: crashed: general protection fault in scatterwalk_copychunks
run #15: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #16: crashed: WARNING in corrupted
run #17: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #18: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #19: crashed: general protection fault in scatterwalk_copychunks
testing current HEAD 78fec1611cbf7b0bdaddfdbf174a3a2463663bff
testing commit 78fec1611cbf7b0bdaddfdbf174a3a2463663bff with gcc (GCC) 8.4.1 20210217
kernel signature: fd62396acf9c425137ecd2760b378f9bbe24dc256f07e175991232598bbec9f1
run #0: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #1: crashed: general protection fault 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: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #5: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #6: crashed: general protection fault in scatterwalk_copychunks
run #7: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #8: crashed: KASAN: slab-out-of-bounds Read in scatterwalk_copychunks
run #9: crashed: general protection fault in scatterwalk_copychunks
revisions tested: 2, total time: 22m43.441118835s (build: 15m37.880033979s, test: 6m23.9795163s)
the crash still happens on HEAD
commit msg: Linux 4.19.183
crash: general protection fault in scatterwalk_copychunks
RBP: 0000000000000001 R08: 000000011d100000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00000000004f8ff8 R14: 00000000004b500d R15: 00007f84e70d26bc
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6569 Comm: syz-executor.1 Not tainted 4.19.183-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:73 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:98 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:82 [inline]
RIP: 0010:scatterwalk_copychunks+0x379/0x610 crypto/scatterwalk.c:55
Code: ff ff 48 89 c7 e8 27 34 2a 00 4c 89 f2 48 c1 ea 03 42 80 3c 3a 00 0f 85 a8 01 00 00 48 8d 70 08 49 89 06 48 89 f2 48 c1 ea 03 <42> 0f b6 14 3a 84 d2 74 09 80 fa 03 0f 8e 6b 01 00 00 48 8b 5d d0
RSP: 0018:ffff8881e3367498 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8881e243776c RCX: 000000000000401d
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881e2437760
RBP: ffff8881e33674f8 R08: ffffed103c536804 R09: ffffed103c536800
R10: 0000000000000000 R11: ffff8881e29b401c R12: 0000000000001000
R13: 000000000000001d R14: ffff8881e3367538 R15: dffffc0000000000
FS:  00007f84e70d2700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000502000 CR3: 00000001e2856003 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 scatterwalk_map_and_copy crypto/scatterwalk.c:72 [inline]
 scatterwalk_map_and_copy+0x128/0x190 crypto/scatterwalk.c:60
 gcmaes_encrypt.constprop.15+0x81b/0xda0 arch/x86/crypto/aesni-intel_glue.c:980
 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+0x462/0xc00 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+0xa25/0x12b0 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: 0033:0x461229
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:00007f84e70d21a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 0000000000461229
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 000000011d100000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00000000004f8ff8 R14: 00000000004b500d R15: 00007f84e70d26bc
Modules linked in:
---[ end trace 7940cccf1f1d19ee ]---
RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:73 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:98 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:82 [inline]
RIP: 0010:scatterwalk_copychunks+0x379/0x610 crypto/scatterwalk.c:55
Code: ff ff 48 89 c7 e8 27 34 2a 00 4c 89 f2 48 c1 ea 03 42 80 3c 3a 00 0f 85 a8 01 00 00 48 8d 70 08 49 89 06 48 89 f2 48 c1 ea 03 <42> 0f b6 14 3a 84 d2 74 09 80 fa 03 0f 8e 6b 01 00 00 48 8b 5d d0
RSP: 0018:ffff8881e3367498 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8881e243776c RCX: 000000000000401d
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881e2437760
RBP: ffff8881e33674f8 R08: ffffed103c536804 R09: ffffed103c536800
R10: 0000000000000000 R11: ffff8881e29b401c R12: 0000000000001000
R13: 000000000000001d R14: ffff8881e3367538 R15: dffffc0000000000
FS:  00007f84e70d2700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000502000 CR3: 00000001e2856003 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400