bisecting fixing commit since 9f31eb60d7a23536bf3902d4dc602f10c822b79e building syzkaller on 34bf9440bd06034f86b5d9ac8afbf078129cbdae testing commit 9f31eb60d7a23536bf3902d4dc602f10c822b79e with gcc (GCC) 8.1.0 kernel signature: bda391fba27d7dec8ac03e2f4601299ebfc5d52af075ab7288db603f185bb566 all runs: crashed: general protection fault in scatterwalk_copychunks testing current HEAD a1b977b49b66c75e6c51a515f6700371ae720217 testing commit a1b977b49b66c75e6c51a515f6700371ae720217 with gcc (GCC) 8.1.0 kernel signature: 7ef7b765f6410b32ef5de57be17e47363eb8a4d9c55e9ff066347794992d159d run #0: crashed: general protection fault in scatterwalk_copychunks run #1: crashed: general protection fault 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: general protection fault in corrupted run #6: crashed: general protection fault in scatterwalk_copychunks run #7: crashed: general protection fault in scatterwalk_copychunks run #8: crashed: general protection fault in scatterwalk_copychunks run #9: crashed: general protection fault in corrupted revisions tested: 2, total time: 25m10.374093154s (build: 17m44.546180793s, test: 6m10.911898235s) the crash still happens on HEAD commit msg: Linux 4.19.150 crash: general protection fault in corrupted kasan: GPF could be caused by NULL-ptr deref or user memory access 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 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0x5/0x13 lib/fault-inject.c:149 general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7522 Comm: syz-executor.1 Not tainted 4.19.150-syzkaller #0 __should_failslab+0xba/0xf0 mm/failslab.c:32 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 should_failslab+0x9/0x14 mm/slab_common.c:1588 RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:73 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:98 [inline] RIP: 0010:scatterwalk_copychunks+0x379/0x610 crypto/scatterwalk.c:55 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 Code: ff ff 48 89 c7 e8 87 9a 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:ffff888095297158 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff888095297244 RCX: 0000000000000021 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 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888095297238 RBP: ffff8880952971b8 R08: ffffed100e85b005 R09: ffffed100e85b002 tls_sw_sendpage+0x458/0xc00 net/tls/tls_sw.c:585 R10: 0000000000000000 R11: ffff8880742d8020 R12: 0000000000000004 R13: 000000000000000c R14: ffff8880952971f8 R15: dffffc0000000000 FS: 00007faa55a13700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 inet_sendpage+0x122/0x600 net/ipv4/af_inet.c:815 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fefbe62c000 CR3: 0000000098559000 CR4: 00000000001406f0 kernel_sendpage+0x60/0xd0 net/socket.c:3378 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sock_sendpage+0x6d/0xd0 net/socket.c:847 scatterwalk_map_and_copy+0x128/0x190 crypto/scatterwalk.c:72 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 gcmaes_crypt_by_sg.constprop.16+0x36d/0x14c0 arch/x86/crypto/aesni-intel_glue.c:911 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 gcmaes_encrypt.constprop.15+0x59f/0xda0 arch/x86/crypto/aesni-intel_glue.c:932 __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:00007fca0333fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fca0333fc90 RCX: 0000000000459349 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000100000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fca033406d4 R13: 00000000004c887b R14: 00000000004de6b0 R15: 0000000000000005 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:00007faa55a12c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007faa55a12c90 RCX: 0000000000459349 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000100000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007faa55a136d4 R13: 00000000004c887b R14: 00000000004de6b0 R15: 0000000000000005 Modules linked in: FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7535 Comm: syz-executor.4 Tainted: G D 4.19.150-syzkaller #0 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 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 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 should_failslab+0x9/0x14 mm/slab_common.c:1588 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc_node mm/slab.c:3304 [inline] kmem_cache_alloc_node_trace+0x26d/0x730 mm/slab.c:3666 __do_kmalloc_node mm/slab.c:3688 [inline] __kmalloc_node_track_caller+0x3c/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_fclone include/linux/skbuff.h:1037 [inline] sk_stream_alloc_skb+0x9e/0x810 net/ipv4/tcp.c:882 do_tcp_sendpages+0x772/0x1e10 net/ipv4/tcp.c:1001 tcp_sendpage_locked+0x63/0xa0 net/ipv4/tcp.c:1104 tcp_sendpage+0x37/0x50 net/ipv4/tcp.c:1114 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:00007ff1d00e0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007ff1d00e0c90 RCX: 0000000000459349 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000100000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff1d00e16d4 R13: 00000000004c887b R14: 00000000004de6b0 R15: 0000000000000005 CPU: 1 PID: 7539 Comm: syz-executor.2 Tainted: G D 4.19.150-syzkaller #0 ---[ end trace 613add172848b8ea ]--- 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 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0x5/0x13 lib/fault-inject.c:149 RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:73 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:98 [inline] RIP: 0010:scatterwalk_copychunks+0x379/0x610 crypto/scatterwalk.c:55 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1588 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc_node mm/slab.c:3304 [inline] kmem_cache_alloc_node_trace+0x26d/0x730 mm/slab.c:3666 __do_kmalloc_node mm/slab.c:3688 [inline] __kmalloc_node_track_caller+0x3c/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_fclone include/linux/skbuff.h:1037 [inline] sk_stream_alloc_skb+0x9e/0x810 net/ipv4/tcp.c:882 do_tcp_sendpages+0x772/0x1e10 net/ipv4/tcp.c:1001 tcp_sendpage_locked+0x63/0xa0 net/ipv4/tcp.c:1104 tcp_sendpage+0x37/0x50 net/ipv4/tcp.c:1114 inet_sendpage+0x122/0x600 net/ipv4/af_inet.c:815 Code: ff ff 48 89 c7 e8 87 9a 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 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:00007f4cd545ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f4cd545ec90 RCX: 0000000000459349 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000100000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4cd545f6d4 R13: 00000000004c887b R14: 00000000004de6b0 R15: 0000000000000005 RSP: 0018:ffff888095297158 EFLAGS: 00010202 CPU: 0 PID: 7516 Comm: syz-executor.5 Tainted: G D 4.19.150-syzkaller #0 RAX: 0000000000000000 RBX: ffff888095297244 RCX: 0000000000000021 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 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0x5/0x13 lib/fault-inject.c:149 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888095297238 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1588 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc_node mm/slab.c:3304 [inline] kmem_cache_alloc_node_trace+0x26d/0x730 mm/slab.c:3666 RBP: ffff8880952971b8 R08: ffffed100e85b005 R09: ffffed100e85b002 __do_kmalloc_node mm/slab.c:3688 [inline] __kmalloc_node_track_caller+0x3c/0x70 mm/slab.c:3703 R10: 0000000000000000 R11: ffff8880742d8020 R12: 0000000000000004 __kmalloc_reserve.isra.39+0x2c/0xc0 net/core/skbuff.c:137 __alloc_skb+0xd7/0x580 net/core/skbuff.c:205 R13: 000000000000000c R14: ffff8880952971f8 R15: dffffc0000000000 alloc_skb_fclone include/linux/skbuff.h:1037 [inline] sk_stream_alloc_skb+0x9e/0x810 net/ipv4/tcp.c:882 FS: 00007faa55a13700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 do_tcp_sendpages+0x772/0x1e10 net/ipv4/tcp.c:1001 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 tcp_sendpage_locked+0x63/0xa0 net/ipv4/tcp.c:1104 CR2: 000000000075c000 CR3: 0000000098559000 CR4: 00000000001406e0 tcp_sendpage+0x37/0x50 net/ipv4/tcp.c:1114 inet_sendpage+0x122/0x600 net/ipv4/af_inet.c:815 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kernel_sendpage+0x60/0xd0 net/socket.c:3378 sock_sendpage+0x6d/0xd0 net/socket.c:847 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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