bisecting fixing commit since 555161ee1b7a74e77ca70fd14ed8a5137c8108ac building syzkaller on 2e29b534005e52c57d726201644ea28ba33a9a3d testing commit 555161ee1b7a74e77ca70fd14ed8a5137c8108ac with gcc (GCC) 8.1.0 kernel signature: 21bc8e7feb7062506ec0ae22bf63c1dc89b878a8b302ad3d7d0b9bb7252ff44a 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: 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: slab-out-of-bounds Read in scatterwalk_copychunks run #7: crashed: general protection fault in corrupted run #8: crashed: general protection fault in corrupted run #9: crashed: KASAN: slab-out-of-bounds in scatterwalk_copychunks testing current HEAD b499cf4b3a901e87e1f933df04abf69b54de4457 testing commit b499cf4b3a901e87e1f933df04abf69b54de4457 with gcc (GCC) 8.1.0 kernel signature: eb01ace2a44bc8feace6a2c1285018df22f51be88f121a0872a6f7991339ef37 run #0: crashed: KASAN: use-after-free Read in scatterwalk_copychunks run #1: crashed: general protection fault in scatterwalk_copychunks run #2: crashed: general protection fault in corrupted run #3: crashed: KASAN: slab-out-of-bounds Read 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: use-after-free Read 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: WARNING in static_key_slow_dec revisions tested: 2, total time: 25m4.96673354s (build: 17m10.720507402s, test: 7m1.114886546s) the crash still happens on HEAD commit msg: Linux 4.19.102 crash: WARNING in static_key_slow_dec should_failslab+0x9/0x14 mm/slab_common.c:1558 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 WARNING: CPU: 1 PID: 7412 at kernel/jump_label.c:195 __static_key_slow_dec_cpuslocked+0xd2/0xf0 kernel/jump_label.c:194 Kernel panic - not syncing: panic_on_warn set ... alloc_skb_fclone include/linux/skbuff.h:1037 [inline] sk_stream_alloc_skb+0x9e/0x810 net/ipv4/tcp.c:874 do_tcp_sendpages+0x772/0x1e10 net/ipv4/tcp.c:993 tcp_sendpage_locked+0x63/0xa0 net/ipv4/tcp.c:1096 tcp_sendpage+0x37/0x50 net/ipv4/tcp.c:1106 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: 0033:0x459a29 Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9ab1f2ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f9ab1f2ec90 RCX: 0000000000459a29 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 000000011d100000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9ab1f2f6d4 R13: 00000000004c9478 R14: 00000000004dfdd8 R15: 0000000000000005 CPU: 1 PID: 7412 Comm: syz-executor.3 Not tainted 4.19.102-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 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.8+0x1b/0x3e kernel/panic.c:541 report_bug+0x1a4/0x200 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 RIP: 0010:__static_key_slow_dec_cpuslocked+0xd2/0xf0 kernel/jump_label.c:194 Code: b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1d 8b 03 85 c0 0f 89 75 ff ff ff 48 c7 c7 80 23 d1 86 e8 a1 44 c1 ff <0f> 0b e9 62 ff ff ff 48 89 df e8 af 19 19 00 eb d9 e8 c8 19 19 00 RSP: 0018:ffff8880750ffcc8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffffffff8a6065e0 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff86ff2560 RDI: ffffffff89a876a0 RBP: ffff8880750ffce0 R08: ffffed1015d65079 R09: ffffed1015d65078 R10: ffffed1015d65078 R11: ffff8880aeb283c7 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88809bf127f0 R15: ffff88809bf12780 __static_key_slow_dec kernel/jump_label.c:213 [inline] static_key_slow_dec+0x4c/0x80 kernel/jump_label.c:227 clean_acked_data_disable+0x14/0x50 net/ipv4/tcp_input.c:128 tls_set_device_offload+0x9ec/0xd10 net/tls/tls_device.c:835 do_tls_setsockopt_conf net/tls/tls_main.c:472 [inline] do_tls_setsockopt net/tls/tls_main.c:525 [inline] tls_setsockopt+0x23c/0x630 net/tls/tls_main.c:544 sock_common_setsockopt+0x73/0xf0 net/core/sock.c:3046 __sys_setsockopt+0x13e/0x210 net/socket.c:1901 __do_sys_setsockopt net/socket.c:1912 [inline] __se_sys_setsockopt net/socket.c:1909 [inline] __x64_sys_setsockopt+0xb9/0x150 net/socket.c:1909 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4e0644bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459a29 RDX: 0000000000000001 RSI: 000000000000011a RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000028 R09: 0000000000000000 R10: 0000000020000a40 R11: 0000000000000246 R12: 00007f4e0644c6d4 R13: 00000000004c82cd R14: 00000000004de6b0 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..