bisecting fixing commit since e109a984cf380b4b80418b7477c970bfeb428325 building syzkaller on bfb4a51e30c8c04658a2675333b9b89a9d327c4a testing commit e109a984cf380b4b80418b7477c970bfeb428325 with gcc (GCC) 8.1.0 kernel signature: 334a92257cfffe25cd360994638ae3a9020f65ebd0fe69aaeb88c60f5b1f5e95 all runs: crashed: KASAN: use-after-free Read in tls_write_space testing current HEAD f6d5cb9e2c06f7d583dd9f4f7cca21d13d78c32a testing commit f6d5cb9e2c06f7d583dd9f4f7cca21d13d78c32a with gcc (GCC) 8.1.0 kernel signature: 3c3f982aac3c288e4746aa6d929a9dcb70d9c84f4a14535ed7c0ecf0ff51ada3 run #0: crashed: WARNING in static_key_slow_dec run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in corrupted run #3: crashed: WARNING in __static_key_slow_dec_cpuslocked run #4: crashed: WARNING in __static_key_slow_dec_cpuslocked run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK revisions tested: 2, total time: 34m2.260750819s (build: 19m28.417603602s, test: 12m54.244765899s) the crash still happens on HEAD commit msg: Linux 4.19.142 crash: WARNING in __static_key_slow_dec_cpuslocked 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 ------------[ cut here ]------------ jump label: negative count! WARNING: CPU: 0 PID: 10197 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: 10197 Comm: syz-executor.5 Not tainted 4.19.142-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:1038 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 00 33 f1 86 e8 e1 f2 c0 ff <0f> 0b e9 62 ff ff ff 48 89 df e8 1f 40 19 00 eb d9 e8 38 40 19 00 RSP: 0018:ffff88808b3bfc10 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffffffff8a80b2e0 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff871f45c0 RDI: ffffffff89c8b6a0 RBP: ffff88808b3bfc28 R08: ffffed1015d45079 R09: ffffed1015d45078 R10: ffffed1015d45078 R11: ffff8880aea283c7 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000fffffdf4 R15: ffff888096939a80 __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+0x9dd/0xd50 net/tls/tls_device.c:855 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:3072 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: 0033:0x4592f9 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:00007f60cd39cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004592f9 RDX: 0000000000000001 RSI: 000000000000011a RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000028 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 00007f60cd39d6d4 R13: 00000000004c7613 R14: 00000000004dcbb8 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..