Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is git://git.infradead.org/users/willy/linux-dax.git idr-2016-12-16 commit d13fbbcb97c36334c73c8c67b96c895381563d01 Author: Matthew Wilcox <mawilcox(a)microsoft.com&gt; AuthorDate: Sat Dec 17 17:32:00 2016 -0500 Commit: Matthew Wilcox <mawilcox(a)microsoft.com&gt; CommitDate: Sat Dec 17 17:32:00 2016 -0500 idr: Handle exceptional entries anywhere My original idea was to only use an exceptional entry at the root of the tree, and to expand the entry into a bitmap whenever any bit anywhere beyond BITS_PER_LONG - 2 was set. But that's more complex than just supporting exceptional entries anywhere in the tree, as the new test case demonstrates. Also, the new code never fails to allocate an IDA where the previous one could require more memory to be allocated. I'll merge this with the previous patch before submission. Signed-off-by: Matthew Wilcox <mawilcox(a)microsoft.com&gt; +----------------------------------+------------+------------+------------+ | | 3d145dc3ef | d13fbbcb97 | d13fbbcb97 | +----------------------------------+------------+------------+------------+ | boot_successes | 63 | 0 | 0 | | boot_failures | 0 | 13 | 13 | | WARNING:at_lib/idr.c:#ida_remove | 0 | 13 | 13 | +----------------------------------+------------+------------+------------+ [ 0.937484] ACPI: bus type PCI registered [ 0.938160] PCI: Using configuration type 1 for base access [ 0.961748] ------------[ cut here ]------------ [ 0.962357] WARNING: CPU: 0 PID: 1 at lib/idr.c:327 ida_remove+0xd2/0x120 [ 0.963362] ida_remove called for id=1026 which is not allocated. [ 0.964173] Modules linked in: [ 0.964617] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.0-rc8-mm1-00334-gd13fbbc #169 [ 0.965705] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 [ 0.985103] Call Trace: [ 0.985471] dump_stack+0x58/0x79 [ 0.985961] __warn+0xf5/0x110 [ 0.986430] ? ida_remove+0xd2/0x120 git bisect start d13fbbcb97c36334c73c8c67b96c895381563d01 026142ac445639730830629002e24a7083a2763c -- git bisect good 4cfaeffbcf091d1ef08bb7f1eb6bb4d89d1c60aa # 20:13 22+ 0 ida: Move ida_bitmap to a percpu variable git bisect good bbf727264b396b28c3c9143d56be93bfe334c609 # 20:22 21+ 0 radix tree test suite: Reduce kernel.h git bisect good 57b4ccae27adaed954f03e3323bc20e0493c0f00 # 20:32 22+ 0 radix tree test suite: Remove bitops.h git bisect good 217a1be9f02affd94610f749ea2e988ac9242493 # 20:44 22+ 0 radix tree test suite: More decluttering kernel.h git bisect good 3d145dc3ef3317f0fd7270a95d76aebbcf7e1eac # 20:54 22+ 0 ida: Use exceptional entries for small IDAs # first bad commit: [d13fbbcb97c36334c73c8c67b96c895381563d01] idr: Handle exceptional entries anywhere git bisect good 3d145dc3ef3317f0fd7270a95d76aebbcf7e1eac # 20:55 60+ 0 ida: Use exceptional entries for small IDAs # extra tests with CONFIG_DEBUG_INFO_REDUCED git bisect bad d13fbbcb97c36334c73c8c67b96c895381563d01 # 21:04 0- 44 idr: Handle exceptional entries anywhere # extra tests on HEAD of dax/idr-2016-12-16 git bisect bad d13fbbcb97c36334c73c8c67b96c895381563d01 # 21:04 0- 13 idr: Handle exceptional entries anywhere # extra tests on tree/branch dax/idr-2016-12-16 git bisect bad d13fbbcb97c36334c73c8c67b96c895381563d01 # 21:04 0- 13 idr: Handle exceptional entries anywhere # extra tests with first bad commit reverted git bisect good db0520019ffe348e50259bc311f526e40f7a9db3 # 21:16 65+ 0 Revert "idr: Handle exceptional entries anywhere" # extra tests on tree/branch linus/master git bisect good 52f40e9d657cc126b766304a5dd58ad73b02ff46 # 21:19 61+ 9 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net # extra tests on tree/branch linux-next/master git bisect good bf579a3afa46c74b7e89930974ba119d4c76bab2 # 21:27 66+ 10 Add linux-next specific files for 20161216 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation