Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is git://git.infradead.org/users/hch/block.git req_op commit 5f1c7c9dade4024822e60db44f70fde6ebe92df7 Author: Christoph Hellwig <hch(a)lst.de&gt; AuthorDate: Thu Jun 9 14:16:03 2016 +0200 Commit: Christoph Hellwig <hch(a)lst.de&gt; CommitDate: Thu Jun 9 15:08:31 2016 +0200 block: replace req->cmd_type and the op type with req->op +--------------------------------------------------------------------------+------------+------------+------------+ | | c502e01d03 | 5f1c7c9dad | d1b3cde99d | +--------------------------------------------------------------------------+------------+------------+------------+ | boot_successes | 66 | 0 | 0 | | boot_failures | 0 | 23 | 13 | | BUG:unable_to_handle_kernel | 0 | 22 | 13 | | Oops | 0 | 23 | 13 | | RIP:blk_account_io_completion | 0 | 21 | 13 | | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 23 | 13 | | backtrace:do_sys_open | 0 | 3 | | | backtrace:SyS_open | 0 | 3 | | | WARNING:at_block/blk-exec.c:#blk_execute_rq_nowait | 0 | 13 | 12 | | backtrace:vfs_read | 0 | 18 | 12 | | backtrace:SyS_read | 0 | 18 | 12 | | backtrace:do_group_exit | 0 | 1 | | | backtrace:SyS_exit_group | 0 | 1 | | | backtrace:do_unlinkat | 0 | 1 | | | backtrace:SyS_unlink | 0 | 1 | | | backtrace:user_path_at_empty | 0 | 2 | 2 | | backtrace:SyS_readlinkat | 0 | 2 | 2 | | backtrace:SyS_readlink | 0 | 2 | 2 | | RIP:#:[<#>]s_bi[n</mfofdpfrofbef'f'ff813e2580>]blk_account_io_completion | 0 | 1 | | | backtrace:__sys_sendmsg | 0 | 1 | | | backtrace:SyS_sendmsg | 0 | 1 | | | backtrace:path_init | 0 | 1 | | | backtrace:sock_create | 0 | 0 | 1 | | backtrace:SyS_socket | 0 | 0 | 1 | | backtrace:do_munmap | 0 | 0 | 2 | | backtrace:SyS_munmap | 0 | 0 | 2 | | backtrace:vfs_stat | 0 | 0 | 2 | | backtrace:SyS_newstat | 0 | 0 | 2 | +--------------------------------------------------------------------------+------------+------------+------------+ udevd[259]: failed to execute '/sbin/modprobe' '/sbin/modprobe -bv acpi:LNXSYBUS:': No such file or directory udevd[261]: failed to execute '/sbin/modprobe' '/sbin/modprobe -bv acpi:LNXSYBUS:': No such file or directory udevd[262]: failed to execute '/sbin/modprobe' '/sbin/modprobe -bv ide:m-cdrom': No such file or directory [ 11.174434] BUG: unable to handle kernel NULL pointer dereference at 00000000000004f8 [ 11.175798] IP: [<ffffffff813e2580>] blk_account_io_completion+0x71/0xe8 [ 11.176910] PGD 0 [ 11.177219] ------------[ cut here ]------------ [ 11.177224] WARNING: CPU: 0 PID: 244 at block/blk-exec.c:58 blk_execute_rq_nowait+0x68/0x108 [ 11.177227] CPU: 0 PID: 244 Comm: udevd Tainted: G W 4.7.0-rc2-00069-g5f1c7c9 #8 [ 11.177228] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 11.177229] 0000000000000000 ffff88000a1d3b20 ffffffff813fa82f 0000000000000000 [ 11.177232] ffffffff8224f7da ffff88000a1d3b60 ffffffff810796d4 0000003a0a1d3c48 [ 11.177236] ffff880012040000 ffff880012020cf8 0000000000000002 0000000000000000 [ 11.177238] Call Trace: [ 11.177242] [<ffffffff813fa82f>] dump_stack+0x61/0x7e [ 11.177245] [<ffffffff810796d4>] __warn+0xb3/0xce [ 11.177247] [<ffffffff8107979c>] warn_slowpath_null+0x18/0x1a [ 11.177249] [<ffffffff813e7516>] blk_execute_rq_nowait+0x68/0x108 [ 11.177251] [<ffffffff813e748e>] ? blk_rq_map_kern+0x121/0x121 [ 11.177253] [<ffffffff813e7676>] blk_execute_rq+0xc0/0x108 [ 11.177257] [<ffffffff815b2dff>] virtblk_serial_show+0x8d/0xc9 [ 11.177259] [<ffffffff81593fe6>] dev_attr_show+0x20/0x44 [ 11.177261] [<ffffffff811b41d6>] sysfs_kf_seq_show+0x7a/0xca [ 11.177263] [<ffffffff811b2e1d>] kernfs_seq_show+0x21/0x23 [ 11.177265] [<ffffffff8117a41b>] seq_read+0x174/0x349 [ 11.177267] [<ffffffff811b35f4>] kernfs_fop_read+0x37/0x168 [ 11.177269] [<ffffffff8115b366>] __vfs_read+0x21/0xeb [ 11.177271] [<ffffffff81163dde>] ? putname+0x44/0x47 [ 11.177273] [<ffffffff81412857>] ? debug_check_no_obj_freed+0x12/0x14 [ 11.177276] [<ffffffff81148a8b>] ? kmem_cache_free+0x145/0x1c8 [ 11.177278] [<ffffffff8115b4d1>] vfs_read+0xa1/0x10f [ 11.177279] [<ffffffff8115b89a>] SyS_read+0x4c/0x89 [ 11.177282] [<ffffffff81d0e976>] entry_SYSCALL_64_fastpath+0x1e/0xad [ 11.177283] ---[ end trace d46d56a1b7009c59 ]--- git bisect start d1b3cde99d4434330e0e50159690c6f50e971d94 af8c34ce6ae32addda3788d54a7e340cad22516b -- git bisect bad 0e78022404e1ddcc4d03bd217449086033053dd2 # 02:44 2- 20 Merge 'linux-review/Kamal-Mostafa/Patch-MIPS-lib-Mark-intrinsics-notrace-has-been-added-to-the-4-2-y-ckt-tree/20160609-225100' into devel-catchup-201606092309 git bisect bad 2c7a96acf16691c07935a6acfeda4744538ecb53 # 02:50 0- 23 Merge 'linux-review/Kamal-Mostafa/Patch-MIPS-KVM-Fix-timer-IRQ-race-when-freezing-timer-has-been-added-to-the-4-2-y-ckt-tree/20160609-223834' into devel-catchup-201606092309 git bisect bad 108215e866d3cf602b0c268cb5549aef95dd1427 # 02:56 0- 6 Merge 'linux-review/Andrea-Merello/Add-DRM-driver-for-OpenCores-VGA-LCD-display/20160609-215802' into devel-catchup-201606092309 git bisect good 435a7a783cecc2a62cd70981c06bace98425d26c # 03:01 23+ 0 0day base guard for 'devel-catchup-201606092309' git bisect bad ffd803ea3cf8cf1d72a95d6ac42cea284ca54d46 # 03:06 0- 27 Merge 'hch-block/req_op' into devel-catchup-201606092309 git bisect good 8fe0d473f5477e9916d3ac581a226acfe83142be # 03:11 22+ 0 block: convert merge/insert code to check for REQ_OPs. git bisect good c45741d9e3f6ecb73c0dd7ead63abff2cc337c23 # 03:20 21+ 0 Merge branch 'for-4.8/core' into for-next git bisect good 7e6984260fa491dca086cf8a342488c4f93536fc # 03:33 23+ 0 Merge branch 'for-4.8/core' into for-next git bisect good 8cc62b37f584445556c8743d2e56dd4863c02f4d # 03:44 23+ 0 mg_disk: fix enum REQ_OP_ kbuild error git bisect good c502e01d03fbc71e9cf2654c6ed61f2d75a68db8 # 03:54 23+ 0 block: add a separate operation type for secure erase git bisect bad 5f1c7c9dade4024822e60db44f70fde6ebe92df7 # 03:56 1- 21 block: replace req->cmd_type and the op type with req->op # first bad commit: [5f1c7c9dade4024822e60db44f70fde6ebe92df7] block: replace req->cmd_type and the op type with req->op git bisect good c502e01d03fbc71e9cf2654c6ed61f2d75a68db8 # 03:59 66+ 0 block: add a separate operation type for secure erase # extra tests on HEAD of linux-devel/devel-catchup-201606092309 git bisect bad d1b3cde99d4434330e0e50159690c6f50e971d94 # 03:59 0- 13 0day head guard for 'devel-catchup-201606092309' # extra tests on tree/branch hch-block/req_op git bisect bad 5f1c7c9dade4024822e60db44f70fde6ebe92df7 # 04:01 0- 23 block: replace req->cmd_type and the op type with req->op # extra tests with first bad commit reverted git bisect good d26046e3f0b5878bd143ddffa2336d84dfa310ed # 04:38 69+ 0 Revert "block: replace req->cmd_type and the op type with req->op" # extra tests on tree/branch linus/master git bisect good c8ae067f2635be0f8c7e5db1bb74b757d623e05b # 04:45 68+ 0 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs # extra tests on tree/branch linux-next/master git bisect good 8f6027f7e808ed7c1fd8c8d37fc7a5076c683c4f # 05:10 69+ 0 Add linux-next specific files for 20160609 This script may reproduce the error. ---------------------------------------------------------------------------- #!/bin/bash kernel=$1 initrd=quantal-core-x86_64.cgz wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd kvm=( qemu-system-x86_64 -enable-kvm -cpu kvm64 -kernel $kernel -initrd $initrd -m 300 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -serial stdio -display none -monitor null ) append=( hung_task_panic=1 earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw drbd.minor_count=8 ) "${kvm[@]}" --append "${append[*]}" ---------------------------------------------------------------------------- --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation