bisecting fixing commit since 22da5264abf497a10a4ed629f07f4ba28a7ed5eb building syzkaller on 131df97d431404458e805009bda794abfb00f45f testing commit 22da5264abf497a10a4ed629f07f4ba28a7ed5eb compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: d32912ffdd660012e1fa8bf797e7ae553ac5b23d797c8a6b9c75ab937449962c run #0: basic kernel testing failed: BUG: program execution failed: executor NUM: EOF run #1: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #2: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #3: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #4: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #5: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #6: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #7: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #8: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #9: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #10: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #11: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #12: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #13: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #14: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #15: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #16: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #17: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #18: crashed: WARNING: suspicious RCU usage in hsr_node_get_first run #19: crashed: WARNING: suspicious RCU usage in hsr_node_get_first testing current HEAD 143a6252e1b8ab424b4b293512a97cca7295c182 testing commit 143a6252e1b8ab424b4b293512a97cca7295c182 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 4cfa3cf50fb853350d7ba54374e216d79659d21eeda55656509e4a1e3315a579 all runs: crashed: WARNING: suspicious RCU usage in hsr_node_get_first revisions tested: 2, total time: 22m31.743146072s (build: 15m40.643114176s, test: 6m20.307543461s) the crash still happens on HEAD commit msg: Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux crash: WARNING: suspicious RCU usage in hsr_node_get_first netlink: 'syz-executor.0': attribute type 2 has an invalid length. netlink: 194488 bytes leftover after parsing attributes in process `syz-executor.0'. ============================= WARNING: suspicious RCU usage 5.18.0-syzkaller #0 Not tainted ----------------------------- net/hsr/hsr_framereg.c:41 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 3 locks held by syz-executor.0/4068: #0: ffffffff8c73b2f0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x10/0x30 net/netlink/genetlink.c:802 #1: ffffffff8c73b3a8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff8c73b3a8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x315/0x4a0 net/netlink/genetlink.c:790 #2: ffffffff8af78ae0 (rcu_read_lock){....}-{1:2}, at: hsr_get_node_list+0xc1/0x8f0 net/hsr/hsr_netlink.c:425 stack backtrace: CPU: 1 PID: 4068 Comm: syz-executor.0 Not tainted 5.18.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 hsr_node_get_first+0x76/0xa0 net/hsr/hsr_framereg.c:41 hsr_get_next_node+0x1b3/0x330 net/hsr/hsr_framereg.c:608 hsr_get_node_list+0x2c2/0x8f0 net/hsr/hsr_netlink.c:461 genl_family_rcv_msg_doit+0x1e4/0x2f0 net/netlink/genetlink.c:731 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x27a/0x4a0 net/netlink/genetlink.c:792 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2502 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x433/0x710 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x782/0xc30 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 ____sys_sendmsg+0x5c2/0x7a0 net/socket.c:2445 ___sys_sendmsg+0xd3/0x150 net/socket.c:2499 __sys_sendmsg+0xb9/0x150 net/socket.c:2528 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f809ba890e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f809ccc8168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f809bb9bf60 RCX: 00007f809ba890e9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007f809bae308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd7bceafff R14: 00007f809ccc8300 R15: 0000000000022000