bisecting fixing commit since cd02217a5d813e2bbec984a9eeb8280ff290a150
building syzkaller on 6436ce4bcd8e2c7dcca0b171ac91f51e96d973f8
testing commit cd02217a5d813e2bbec984a9eeb8280ff290a150 with gcc (GCC) 8.4.1 20210217
kernel signature: a7a58c3277dc1a57cf8469e86502eb7981a3d6e984ef01147a4ff50804609d1d
all runs: crashed: WARNING in rtnl_delete_link
testing current HEAD d936eb23874433caa3e3d841cfa16f5434b85dcf
testing commit d936eb23874433caa3e3d841cfa16f5434b85dcf with gcc (GCC) 10.2.1 20210217
kernel signature: ba48546be1d74d1ffc155dba58829c14121c277473f5b7a3033b20e01d1c36ad
all runs: crashed: WARNING in rtnl_dellink
revisions tested: 2, total time: 20m33.852144808s (build: 12m16.706368616s, test: 7m22.251218903s)
the crash still happens on HEAD
commit msg: Revert "Makefile: Enable -Wimplicit-fallthrough for Clang"
crash: WARNING in rtnl_dellink
bond1 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8616 at net/core/dev.c:11098 netdev_has_any_lower_dev net/core/dev.c:7361 [inline]
WARNING: CPU: 1 PID: 8616 at net/core/dev.c:11098 unregister_netdevice_many+0xffa/0x1540 net/core/dev.c:11099
Modules linked in:
CPU: 1 PID: 8616 Comm: syz-executor.5 Not tainted 5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unregister_netdevice_many+0xffa/0x1540 net/core/dev.c:11098
Code: 26 fb ff ff ba c1 1c 00 00 48 c7 c6 c0 1e 9b 88 48 c7 c7 00 1f 9b 88 c6 05 97 60 9d 04 01 e8 5d 9c 9f 01 0f 0b e9 00 fb ff ff <0f> 0b e9 ec fa ff ff 48 89 ef e9 76 fa ff ff 4c 89 44 24 10 e8 ad
RSP: 0018:ffffc900084df2e0 EFLAGS: 00010202
RAX: ffff888109324601 RBX: ffffffff886012a0 RCX: ffffffff8153a38e
RDX: 1ffff110240be814 RSI: 0000000000000008 RDI: ffffffff8a31a520
RBP: ffff88811148d580 R08: 0000000000000000 R09: ffffffff8a31a527
R10: fffffbfff14634a4 R11: 000000000006c087 R12: ffffed10240be819
R13: dffffc0000000000 R14: ffff88811148d580 R15: ffff8881205f4000
FS:  00007fcc57754700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdbb1bb3000 CR3: 000000011bba5001 CR4: 00000000001706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rtnl_delete_link net/core/rtnetlink.c:3065 [inline]
 rtnl_dellink+0x2cf/0x9b0 net/core/rtnetlink.c:3117
 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5574
 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x704/0xbf0 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:703 [inline]
 sock_sendmsg+0xab/0xe0 net/socket.c:723
 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2392
 ___sys_sendmsg+0xd3/0x150 net/socket.c:2446
 __sys_sendmsg+0xb2/0x140 net/socket.c:2475
 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+0x44/0xae
RIP: 0033:0x465029
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcc57754188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000055d0e0 RCX: 0000000000465029
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000009
RBP: 00000000004af6d2 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055d0e0
R13: 0000000000a8fb5f R14: 00007fcc57754300 R15: 0000000000022000
irq event stamp: 4295
hardirqs last  enabled at (4341): [<ffffffff814a5724>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1319 [inline]
hardirqs last  enabled at (4341): [<ffffffff814a5724>] finish_lock_switch kernel/sched/core.c:4437 [inline]
hardirqs last  enabled at (4341): [<ffffffff814a5724>] finish_task_switch.isra.0+0x224/0x980 kernel/sched/core.c:4555
hardirqs last disabled at (4382): [<ffffffff8789e0ae>] __schedule+0x116e/0x2170 kernel/sched/core.c:5836
softirqs last  enabled at (4750): [<ffffffff814204f9>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last  enabled at (4750): [<ffffffff814204f9>] __irq_exit_rcu kernel/softirq.c:636 [inline]
softirqs last  enabled at (4750): [<ffffffff814204f9>] irq_exit_rcu+0x229/0x270 kernel/softirq.c:648
softirqs last disabled at (4763): [<ffffffff814204f9>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last disabled at (4763): [<ffffffff814204f9>] __irq_exit_rcu kernel/softirq.c:636 [inline]
softirqs last disabled at (4763): [<ffffffff814204f9>] irq_exit_rcu+0x229/0x270 kernel/softirq.c:648
---[ end trace a129ffef71aa4c01 ]---