bisecting fixing commit since e109a984cf380b4b80418b7477c970bfeb428325
building syzkaller on bfb4a51e30c8c04658a2675333b9b89a9d327c4a
testing commit e109a984cf380b4b80418b7477c970bfeb428325 with gcc (GCC) 8.1.0
kernel signature: 1800b4098b7ae05ce740cb4c0e13c05be76d795e
all runs: crashed: KASAN: use-after-free Read in tls_write_space
testing current HEAD 174651bdf802a2139065e8e31ce950e2f3fc4a94
testing commit 174651bdf802a2139065e8e31ce950e2f3fc4a94 with gcc (GCC) 8.1.0
kernel signature: db65c514b3c0442f3420ef078a29487bb09ebd84
run #0: crashed: WARNING in __static_key_slow_dec_cpuslocked
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 30m57.401198879s (build: 16m22.080828099s, test: 13m20.278207047s)
the crash still happens on HEAD
commit msg: Linux 4.19.87
crash: WARNING in __static_key_slow_dec_cpuslocked
RBP: 000000000075bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb11a3416d4
R13: 00000000004c8efa R14: 00000000004dfbc8 R15: 0000000000000004
------------[ cut here ]------------
jump label: negative count!
WARNING: CPU: 0 PID: 11229 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 ...

CPU: 0 PID: 11229 Comm: syz-executor.0 Not tainted 4.19.87-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 c0 20 d1 86 e8 a1 5e c1 ff <0f> 0b e9 62 ff ff ff 48 89 df e8 8f 19 19 00 eb d9 e8 a8 19 19 00
RSP: 0018:ffff88808c0afc78 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff8a5fa7e0 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff86ff1fa0 RDI: ffffffff89a7d6a0
RBP: ffff88808c0afc90 R08: ffffed1015d45079 R09: ffffed1015d45078
R10: ffffed1015d45078 R11: ffff8880aea283c7 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880956470f0 R15: ffff888095647080
 __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
 smc_setsockopt+0xbc/0x640 net/smc/af_smc.c:1652
 __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: 0033:0x459279
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:00007f2d91995c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459279
RDX: 0000000000000001 RSI: 000000000000011a RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000028 R09: 0000000000000000
R10: 0000000020000140 R11: 0000000000000246 R12: 00007f2d919966d4
R13: 00000000004c7593 R14: 00000000004dcb38 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..