bisecting fixing commit since 9b15f7fae677336e04b9e026ff91854e43165455 building syzkaller on 5d7b90f1af2e3bf33992b75e7fcf0bab6bf49bd6 testing commit 9b15f7fae677336e04b9e026ff91854e43165455 with gcc (GCC) 8.1.0 kernel signature: 7f7173066e48af7768d562ec835dd3a9f5bbfee2ad43789021328b987f0a7279 run #0: crashed: WARNING in corrupted run #1: crashed: WARNING in batadv_iv_send_outstanding_bat_ogm_packet run #2: crashed: WARNING in corrupted run #3: crashed: WARNING in batadv_iv_send_outstanding_bat_ogm_packet run #4: crashed: WARNING in process_one_work run #5: crashed: WARNING in corrupted run #6: crashed: WARNING in process_one_work run #7: crashed: WARNING in process_one_work run #8: crashed: WARNING in corrupted run #9: crashed: WARNING in corrupted testing current HEAD 13d2ce42de8cb98ff952f8de6307f896203854c2 testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.1.0 kernel signature: bf2d9b853de9065e84377261052e520132bfd595cdb461c5ca4d12418df9b54a run #0: crashed: WARNING in corrupted run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in corrupted run #3: crashed: WARNING in corrupted run #4: crashed: WARNING in corrupted run #5: crashed: WARNING in batadv_iv_send_outstanding_bat_ogm_packet run #6: crashed: WARNING in corrupted run #7: crashed: WARNING in corrupted run #8: crashed: WARNING in batadv_iv_send_outstanding_bat_ogm_packet run #9: crashed: WARNING in corrupted revisions tested: 2, total time: 24m29.859252634s (build: 18m6.855992754s, test: 5m36.373407474s) the crash still happens on HEAD commit msg: Linux 4.19.163 crash: WARNING in corrupted netlink_sendmsg+0x765/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 WARNING: CPU: 0 PID: 2381 at net/batman-adv/bat_iv_ogm.c:597 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:597 [inline] WARNING: CPU: 0 PID: 2381 at net/batman-adv/bat_iv_ogm.c:597 batadv_iv_send_outstanding_bat_ogm_packet.cold.25+0x30/0x37 net/batman-adv/bat_iv_ogm.c:1857 Kernel panic - not syncing: panic_on_warn set ... __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c749 Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fba71853c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fba718546d4 RCX: 000000000045c749 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00000000000009cb R14: 00000000004cc77d R15: 0000000000000004 CPU: 0 PID: 2381 Comm: kworker/u4:4 Not tainted 4.19.163-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 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 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 __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:batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:597 [inline] RIP: 0010:batadv_iv_send_outstanding_bat_ogm_packet.cold.25+0x30/0x37 net/batman-adv/bat_iv_ogm.c:1857 Code: 87 e8 5b 22 90 fa 0f 0b e9 f2 a2 ff ff 48 c7 c7 20 54 d9 87 e8 48 22 90 fa e9 e1 a2 ff ff 48 c7 c7 e0 50 d9 87 e8 37 22 90 fa <0f> 0b e9 ce a2 ff ff 48 c7 c7 e0 50 d9 87 e8 24 22 90 fa 0f 0b 4c RSP: 0018:ffff8881eab77cd8 EFLAGS: 00010286 RAX: 0000000000000024 RBX: ffff8881da839848 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87679e40 RDI: ffffffff8a189960 RBP: ffff8881eab77d58 R08: ffffed103ed05079 R09: ffffed103ed05078 R10: ffffed103ed05078 R11: ffff8881f68283c7 R12: ffff8881cdfedd00 R13: ffff8881da8398e0 R14: ffff8881da839800 R15: ffff8881ea4bcdc0 process_one_work+0x830/0x1670 kernel/workqueue.c:2155 worker_thread+0x85/0xb60 kernel/workqueue.c:2298 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 CPU: 1 PID: 7336 Comm: syz-executor.3 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_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.41+0x2c/0xc0 net/core/skbuff.c:137 __alloc_skb+0xd7/0x580 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] nlmsg_new include/net/netlink.h:511 [inline] netlink_ack+0x212/0xa50 net/netlink/af_netlink.c:2389 netlink_rcv_skb+0x2a8/0x3d0 net/netlink/af_netlink.c:2461 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4796 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x650 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x765/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c749 Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f636a0a2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f636a0a36d4 RCX: 000000000045c749 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00000000000009cb R14: 00000000004cc77d R15: 0000000000000004 Kernel Offset: disabled Rebooting in 86400 seconds..