bisecting fixing commit since e109a984cf380b4b80418b7477c970bfeb428325 building syzkaller on bfb4a51e30c8c04658a2675333b9b89a9d327c4a testing commit e109a984cf380b4b80418b7477c970bfeb428325 with gcc (GCC) 8.1.0 kernel signature: 9cb0bc68a45c2a51ca61efefda526c40e647c77815073b98e3bc83cbefb2e49b all runs: crashed: KASAN: use-after-free Read in tls_write_space testing current HEAD 13d2ce42de8cb98ff952f8de6307f896203854c2 testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.1.0 kernel signature: 6e9b7dc160953a36aef3200b829cdb0ecdd9d8af58b0617200832000e9cbbcaf run #0: crashed: WARNING in corrupted run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in corrupted run #3: crashed: WARNING in static_key_slow_dec run #4: crashed: WARNING in static_key_slow_dec run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK revisions tested: 2, total time: 28m42.582606956s (build: 16m50.996916148s, test: 11m5.546088096s) the crash still happens on HEAD commit msg: Linux 4.19.163 crash: WARNING in static_key_slow_dec sk_page_frag_refill+0x46/0x1b0 net/core/sock.c:2240 tcp_sendmsg_locked+0xc58/0x35b0 net/ipv4/tcp.c:1347 WARNING: CPU: 1 PID: 12229 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 ... tcp_sendmsg+0x27/0x40 net/ipv4/tcp.c:1462 inet_sendmsg+0x108/0x440 net/ipv4/af_inet.c:798 smc_sendmsg+0x223/0x320 net/smc/af_smc.c:1487 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 sock_write_iter+0x215/0x420 net/socket.c:901 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 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:00007f1b7ea6ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1b7ea6ac90 RCX: 00000000004592f9 RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 000000000075bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1b7ea6b6d4 R13: 00000000004c8f7a R14: 00000000004dfc48 R15: 0000000000000004 CPU: 1 PID: 12229 Comm: syz-executor.5 Not tainted 4.19.163-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 e0 28 f1 86 e8 01 f1 c0 ff <0f> 0b e9 62 ff ff ff 48 89 df e8 ef 51 19 00 eb d9 e8 08 52 19 00 RSP: 0018:ffff8881cf5d7c10 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffffffff8a802820 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff871f4800 RDI: ffffffff89c836a0 RBP: ffff8881cf5d7c28 R08: ffffed103ed25079 R09: ffffed103ed25078 R10: ffffed103ed25078 R11: ffff8881f69283c7 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000fffffdf4 R15: ffff8881d60b1d40 __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:856 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:00007ff2451c0c78 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: 00007ff2451c16d4 R13: 00000000004c7613 R14: 00000000004dcbb8 R15: 00000000ffffffff CPU: 0 PID: 12242 Comm: syz-executor.0 Not tainted 4.19.163-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 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0x5/0x13 lib/fault-inject.c:149 should_fail_alloc_page mm/page_alloc.c:3088 [inline] prepare_alloc_pages mm/page_alloc.c:4346 [inline] __alloc_pages_nodemask+0x1d5/0x710 mm/page_alloc.c:4393 alloc_pages_current+0xd6/0x1b0 mm/mempolicy.c:2197 alloc_pages include/linux/gfp.h:532 [inline] skb_page_frag_refill+0x20b/0x400 net/core/sock.c:2220 sk_page_frag_refill+0x46/0x1b0 net/core/sock.c:2240 tcp_sendmsg_locked+0xc58/0x35b0 net/ipv4/tcp.c:1347 tcp_sendmsg+0x27/0x40 net/ipv4/tcp.c:1462 inet_sendmsg+0x108/0x440 net/ipv4/af_inet.c:798 smc_sendmsg+0x223/0x320 net/smc/af_smc.c:1487 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 sock_write_iter+0x215/0x420 net/socket.c:901 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x443/0x890 fs/read_write.c:487 vfs_write+0x150/0x4d0 fs/read_write.c:549 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 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:00007f340efffc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f340efffc90 RCX: 00000000004592f9 RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 000000000075bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f340f0006d4 R13: 00000000004c8f7a R14: 00000000004dfc48 R15: 0000000000000004 Kernel Offset: disabled Rebooting in 86400 seconds..