Hi All,
All of my test machines hit the backtrace below with Linus' tree as of
this morning. Any ideas?
josh
[ +0.160966] ===============================
[ +0.000001] [ INFO: suspicious RCU usage. ]
[ +0.000002] 4.3.0-0.rc0.git1.1.fc24.x86_64 #1 Not tainted
[ +0.000001] -------------------------------
[ +0.000002] security/device_cgroup.c:405 device_cgroup:verify_new_ex
called without proper synchronization!
[ +0.000000]
other info that might help us debug this:
[ +0.000001]
rcu_scheduler_active = 1, debug_locks = 0
[ +0.000002] 4 locks held by systemd/1:
[ +0.000010] #0: (sb_writers#6){.+.+.+}, at: [<ffffffff81267f87>]
vfs_write+0x187/0x1a0
[ +0.000006] #1: (&of->mutex){+.+.+.}, at: [<ffffffff812f3996>]
kernfs_fop_write+0x66/0x190
[ +0.000005] #2: (s_active#61){++++.+}, at: [<ffffffff812f399e>]
kernfs_fop_write+0x6e/0x190
[ +0.000007] #3: (devcgroup_mutex){+.+...}, at:
[<ffffffff813ada3c>] devcgroup_access_write+0x3c/0x6e0
[ +0.000000]
stack backtrace:
[ +0.000003] CPU: 3 PID: 1 Comm: systemd Not tainted
4.3.0-0.rc0.git1.1.fc24.x86_64 #1
[ +0.000001] Hardware name: /D34010WYK, BIOS
WYLPT10H.86A.0026.2014.0514.1714 05/14/2014
[ +0.000004] 0000000000000000 000000006dc9945a ffff88040ce73c68
ffffffff8184e49c
[ +0.000003] 0000000000000000 ffff88040cdd4000 ffff88040ce73c98
ffffffff81101437
[ +0.000003] ffff880408646d00 ffff88040ce73d00 0000000000000002
0000000000000001
[ +0.000001] Call Trace:
[ +0.000006] [<ffffffff8184e49c>] dump_stack+0x4c/0x65
[ +0.000004] [<ffffffff81101437>] lockdep_rcu_suspicious+0xd7/0x110
[ +0.000004] [<ffffffff813ad6e8>] verify_new_ex+0xd8/0xe0
[ +0.000003] [<ffffffff813addaf>] devcgroup_access_write+0x3af/0x6e0
[ +0.000005] [<ffffffff81023999>] ? sched_clock+0x9/0x10
[ +0.000004] [<ffffffff811599e4>] cgroup_file_write+0x44/0x1e0
[ +0.000003] [<ffffffff812f3a71>] kernfs_fop_write+0x141/0x190
[ +0.000002] [<ffffffff81267497>] __vfs_write+0x37/0x100
[ +0.000002] [<ffffffff81267f87>] ? vfs_write+0x187/0x1a0
[ +0.000004] [<ffffffff8138929d>] ? security_file_permission+0x3d/0xc0
[ +0.000002] [<ffffffff81267ea9>] vfs_write+0xa9/0x1a0
[ +0.000003] [<ffffffff81268bc8>] SyS_write+0x58/0xd0
[ +0.000004] [<ffffffff818580ee>] entry_SYSCALL_64_fastpath+0x12/0x76
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