Hi, On Wed, Apr 29, 2015 at 03:53:42PM -0400, Mike Snitzer wrote: > http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=wip2 > > Anyway, here it is rebased to 4.1-rc1 (BTW, I'm open to dropping the > WARN_ON_ONCE but I need to research further.. if you guys think that > there are perfectly resonable ways to explain why clone->q is NULL in > the IO completion path then I'm all ears): This fixes the crash I'm seeing, but the WARN ON is still triggering on almost (*) every boot. I'm using rootfs where multipathd is built and started with the default configuration it ships with, and it looks like this: [ OK ] Started Device-Mapper Multipath Device Controller. [ OK ] Started Network Service. Starting Network Name Resolution... [ OK ] Reached target Network. Starting GlusterFS, a clustered file-system server... [ 16.562604] device-mapper: multipath service-time: version 0.2.0 loaded [ 16.586067] device-mapper: table: 253:0: multipath: error getting device [ 16.586428] device-mapper: ioctl: error adding target to table [ 16.679048] device-mapper: multipath: Failing path 8:16. [ OK ] Started Network Name Resolution. [* ] A start job is running for GlusterF...le-system server (13s / 5min 7s) [...] [ 23.034550] ------------[ cut here ]------------ [ 23.035525] WARNING: CPU: 0 PID: 3 at /home/aakoskin/linux/drivers/md/dm.c:1090 free_rq_clone+0xbc/0x130 [dm_mod]() [...] [ 23.041885] Call Trace: [ 23.042064] [<ffffffff8010bc90>] show_stack+0x78/0x90 [ 23.042505] [<ffffffff80133764>] warn_slowpath_common+0xa4/0xe0 [ 23.043019] [<ffffffffc000e37c>] free_rq_clone+0xbc/0x130 [dm_mod] [ 23.043412] [<ffffffffc000e830>] dm_softirq_done+0x198/0x2c0 [dm_mod] [ 23.043775] [<ffffffff803388dc>] blk_done_softirq+0xac/0xc0 [ 23.044076] [<ffffffff80136894>] __do_softirq+0x174/0x368 [ 23.044376] [<ffffffff80136af8>] run_ksoftirqd+0x70/0xa8 [ 23.044668] [<ffffffff8015604c>] smpboot_thread_fn+0x1bc/0x1c8 [ 23.044980] [<ffffffff80152440>] kthread+0xe0/0xf8 [ 23.045247] [<ffffffff80105768>] ret_from_kernel_thread+0x14/0x1c [ 23.045673] [ 23.045824] ---[ end trace e0e5377c5d7b858b ]--- [ 23.046326] blk_update_request: I/O error, dev dm-0, sector 0 [ 23.056271] blk_update_request: I/O error, dev dm-0, sector 0 [ 23.056745] Buffer I/O error on dev dm-0, logical block 0, async page read [ 23.070427] blk_update_request: I/O error, dev dm-0, sector 0 [ 23.070833] Buffer I/O error on dev dm-0, logical block 0, async page read (*) Strange thing is that it only happens when my test bot is booting the system. With interactive console it's OK without any I/O errors. A. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
