$ git describe
v4.0-2620-gb79013b
During setting up partitions with mdadm, mdadm hung, after attaching to mdadm with strace I got next:
# pgrep mdadm | xargs strace -fp
Process 27389 attached - interrupt to quit
unlink("/dev/.tmp.md.27389:9:127") = 0
mknod("/tmp/.tmp.md.27389:9:127", S_IFBLK|0600, makedev(9, 127)) = 0
open("/tmp/.tmp.md.27389:9:127", O_RDWR|O_EXCL|O_DIRECT) <-- *hung*
After, I looked into dmesg, and found this:
[ 9627.630018] ------------[ cut here ]------------
[ 9627.630029] WARNING: CPU: 18 PID: 3330 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x5a/0x70()
[ 9627.630032] sysfs: cannot create duplicate filename '/devices/virtual/bdi/9:127'
[ 9627.630033] Modules linked in: xt_tcpudp iptable_filter ip_tables x_tables nfsd nfs lockd grace sunrpc ipmi_devintf netconsole configfs loop hid_generic usbhid hid x86_pkg_temp_thermal coretemp ghash_clmulni_intel aesni_intel ioatdma ehci_pci aes_x86_64 iTCO_wdt iTCO_ve
[ 9627.630074] CPU: 18 PID: 3330 Comm: mdadm Not tainted 4.0.0bl-azat-v6+ #1
[ 9627.630076] Hardware name: Supermicro X9DRD-7LN4F(-JBOD)/X9DRD-EF/X9DRD-7LN4F, BIOS 3.0a 12/05/2013
[ 9627.630077] 0000000000000000 ffffffff814e3fcc ffffffff813e590f ffff885f9bcd3808
[ 9627.630079] ffffffff8104575c ffff885f96acb000 ffff885fa4b3e3c0 ffff885fa2fec780
[ 9627.630081] ffff885fa4bc4000 0000000000000000 ffffffff810457d5 ffffffff814e5d78
[ 9627.630083] Call Trace:
[ 9627.630091] [<ffffffff813e590f>] ? dump_stack+0x40/0x50
[ 9627.630096] [<ffffffff8104575c>] ? warn_slowpath_common+0x7c/0xb0
[ 9627.630098] [<ffffffff810457d5>] ? warn_slowpath_fmt+0x45/0x50
[ 9627.630100] [<ffffffff81185092>] ? kernfs_path+0x42/0x50
[ 9627.630102] [<ffffffff811883da>] ? sysfs_warn_dup+0x5a/0x70
[ 9627.630104] [<ffffffff8118846e>] ? sysfs_create_dir_ns+0x7e/0x90
[ 9627.630108] [<ffffffff811d94ab>] ? kobject_add_internal+0x9b/0x2f0
[ 9627.630109] [<ffffffff811d9af6>] ? kobject_add+0x66/0xb0
[ 9627.630114] [<ffffffff812bb2e3>] ? device_add+0x263/0x620
[ 9627.630116] [<ffffffff812bb8a8>] ? device_create_groups_vargs+0xe8/0x100
[ 9627.630118] [<ffffffff812bb8d3>] ? device_create_vargs+0x13/0x20
[ 9627.630124] [<ffffffff810ed128>] ? bdi_register+0x68/0x150
[ 9627.630129] [<ffffffff811c535d>] ? add_disk+0x14d/0x4a0
[ 9627.630132] [<ffffffff811c585f>] ? alloc_disk_node+0xaf/0x100
[ 9627.630137] [<ffffffffa0252269>] ? md_alloc+0x1e9/0x350 [md_mod]
[ 9627.630141] [<ffffffffa02523db>] ? md_probe+0xb/0x20 [md_mod]
[ 9627.630143] [<ffffffff812c0654>] ? kobj_lookup+0x104/0x170
[ 9627.630147] [<ffffffffa02523d0>] ? md_alloc+0x350/0x350 [md_mod]
[ 9627.630149] [<ffffffff811c4da8>] ? get_gendisk+0x28/0xf0
[ 9627.630153] [<ffffffff8115fb74>] ? __blkdev_get+0x114/0x3c0
[ 9627.630156] [<ffffffff8115e590>] ? bdev_direct_access+0xa0/0xa0
[ 9627.630158] [<ffffffff8115e5a0>] ? bdev_test+0x10/0x10
[ 9627.630160] [<ffffffff8115fe58>] ? blkdev_get+0x38/0x310
[ 9627.630162] [<ffffffff81160170>] ? blkdev_get_by_dev+0x40/0x40
[ 9627.630167] [<ffffffff8112b3d3>] ? do_dentry_open.isra.16+0x153/0x320
[ 9627.630170] [<ffffffff811380f3>] ? do_last.isra.51+0x323/0xd50
[ 9627.630172] [<ffffffff8111f5b3>] ? kmem_cache_alloc+0x123/0x130
[ 9627.630174] [<ffffffff8113a97f>] ? path_openat+0x7f/0x610
[ 9627.630177] [<ffffffff810f7480>] ? tlb_flush_mmu_free+0x30/0x50
[ 9627.630180] [<ffffffff810fe800>] ? unmap_region+0xb0/0xf0
[ 9627.630182] [<ffffffff8113bb3b>] ? do_filp_open+0x2b/0x90
[ 9627.630187] [<ffffffff811472ec>] ? __alloc_fd+0x7c/0x120
[ 9627.630189] [<ffffffff8112c531>] ? do_sys_open+0x121/0x210
[ 9627.630193] [<ffffffff813ea097>] ? system_call_fastpath+0x12/0x6a
[ 9627.630195] ---[ end trace b7a3e9c6f05c2666 ]---
[ 9627.630196] ------------[ cut here ]------------
[ 9627.630198] WARNING: CPU: 18 PID: 3330 at lib/kobject.c:240 kobject_add_internal+0x274/0x2f0()
[ 9627.630200] kobject_add_internal failed for 9:127 with -EEXIST, don't try to register things with the same name in the same directory.
[ 9627.630201] Modules linked in: xt_tcpudp iptable_filter ip_tables x_tables nfsd nfs lockd grace sunrpc ipmi_devintf netconsole configfs loop hid_generic usbhid hid x86_pkg_temp_thermal coretemp ghash_clmulni_intel aesni_intel ioatdma ehci_pci aes_x86_64 iTCO_wdt iTCO_ve
[ 9627.630223] CPU: 18 PID: 3330 Comm: mdadm Tainted: G W 4.0.0bl-azat-v6+ #1
[ 9627.630224] Hardware name: Supermicro X9DRD-7LN4F(-JBOD)/X9DRD-EF/X9DRD-7LN4F, BIOS 3.0a 12/05/2013
[ 9627.630225] 0000000000000000 ffffffff814f2c88 ffffffff813e590f ffff885f9bcd3858
[ 9627.630227] ffffffff8104575c ffff885fa4bc4010 00000000ffffffef ffff885fa473f420
[ 9627.630229] ffff885fa4bc4000 0000000000000000 ffffffff810457d5 ffffffff814f2e48
[ 9627.630230] Call Trace:
[ 9627.630233] [<ffffffff813e590f>] ? dump_stack+0x40/0x50
[ 9627.630235] [<ffffffff8104575c>] ? warn_slowpath_common+0x7c/0xb0
[ 9627.630236] [<ffffffff810457d5>] ? warn_slowpath_fmt+0x45/0x50
[ 9627.630238] [<ffffffff8118846e>] ? sysfs_create_dir_ns+0x7e/0x90
[ 9627.630240] [<ffffffff811d9684>] ? kobject_add_internal+0x274/0x2f0
[ 9627.630242] [<ffffffff811d9af6>] ? kobject_add+0x66/0xb0
[ 9627.630244] [<ffffffff812bb2e3>] ? device_add+0x263/0x620
[ 9627.630245] [<ffffffff812bb8a8>] ? device_create_groups_vargs+0xe8/0x100
[ 9627.630247] [<ffffffff812bb8d3>] ? device_create_vargs+0x13/0x20
[ 9627.630250] [<ffffffff810ed128>] ? bdi_register+0x68/0x150
[ 9627.630252] [<ffffffff811c535d>] ? add_disk+0x14d/0x4a0
[ 9627.630255] [<ffffffff811c585f>] ? alloc_disk_node+0xaf/0x100
[ 9627.630258] [<ffffffffa0252269>] ? md_alloc+0x1e9/0x350 [md_mod]
[ 9627.630261] [<ffffffffa02523db>] ? md_probe+0xb/0x20 [md_mod]
[ 9627.630262] [<ffffffff812c0654>] ? kobj_lookup+0x104/0x170
[ 9627.630266] [<ffffffffa02523d0>] ? md_alloc+0x350/0x350 [md_mod]
[ 9627.630268] [<ffffffff811c4da8>] ? get_gendisk+0x28/0xf0
[ 9627.630270] [<ffffffff8115fb74>] ? __blkdev_get+0x114/0x3c0
[ 9627.630272] [<ffffffff8115e590>] ? bdev_direct_access+0xa0/0xa0
[ 9627.630274] [<ffffffff8115e5a0>] ? bdev_test+0x10/0x10
[ 9627.630276] [<ffffffff8115fe58>] ? blkdev_get+0x38/0x310
[ 9627.630278] [<ffffffff81160170>] ? blkdev_get_by_dev+0x40/0x40
[ 9627.630280] [<ffffffff8112b3d3>] ? do_dentry_open.isra.16+0x153/0x320
[ 9627.630282] [<ffffffff811380f3>] ? do_last.isra.51+0x323/0xd50
[ 9627.630283] [<ffffffff8111f5b3>] ? kmem_cache_alloc+0x123/0x130
[ 9627.630285] [<ffffffff8113a97f>] ? path_openat+0x7f/0x610
[ 9627.630287] [<ffffffff810f7480>] ? tlb_flush_mmu_free+0x30/0x50
[ 9627.630289] [<ffffffff810fe800>] ? unmap_region+0xb0/0xf0
[ 9627.630291] [<ffffffff8113bb3b>] ? do_filp_open+0x2b/0x90
[ 9627.630293] [<ffffffff811472ec>] ? __alloc_fd+0x7c/0x120
[ 9627.630295] [<ffffffff8112c531>] ? do_sys_open+0x121/0x210
[ 9627.630297] [<ffffffff813ea097>] ? system_call_fastpath+0x12/0x6a
[ 9627.630298] ---[ end trace b7a3e9c6f05c2667 ]---
[ 9627.630395] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
[ 9627.630430] IP: [<ffffffff8118869a>] sysfs_do_create_link_sd.isra.2+0x2a/0xb0
[ 9627.630524] PGD 5fa2d03067 PUD 5f9d679067 PMD 0
[ 9627.630550] Oops: 0000 [#1] SMP
[ 9627.630624] Modules linked in: xt_tcpudp iptable_filter ip_tables x_tables nfsd nfs lockd grace sunrpc ipmi_devintf netconsole configfs loop hid_generic usbhid hid x86_pkg_temp_thermal coretemp ghash_clmulni_intel aesni_intel ioatdma ehci_pci aes_x86_64 iTCO_wdt iTCO_ve
[ 9627.631073] CPU: 18 PID: 3330 Comm: mdadm Tainted: G W 4.0.0bl-azat-v6+ #1
[ 9627.631090] Hardware name: Supermicro X9DRD-7LN4F(-JBOD)/X9DRD-EF/X9DRD-7LN4F, BIOS 3.0a 12/05/2013
[ 9627.631109] task: ffff885fa4659f00 ti: ffff885f9bcd0000 task.ti: ffff885f9bcd0000
[ 9627.631124] RIP: 0010:[<ffffffff8118869a>] [<ffffffff8118869a>] sysfs_do_create_link_sd.isra.2+0x2a/0xb0
[ 9627.631162] RSP: 0018:ffff885f9bcd3a78 EFLAGS: 00010246
[ 9627.631189] RAX: 000000000000e6e6 RBX: 0000000000000040 RCX: 00000000000000e6
[ 9627.631219] RDX: ffffffff814e19d0 RSI: 0000000000000040 RDI: ffffffff81740d88
[ 9627.631249] RBP: ffffffff814e19d0 R08: 0000000000017d60 R09: ffff88607fcd7d60
[ 9627.631278] R10: ffff882fbf802400 R11: ffffea017e830e00 R12: 0000000000000001
[ 9627.631308] R13: ffff885fa5a61ca8 R14: ffff885fa4bc3c70 R15: ffff885fa4bc3c00
[ 9627.631338] FS: 00007f439e991700(0000) GS:ffff88607fcc0000(0000) knlGS:0000000000000000
[ 9627.631383] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 9627.631411] CR2: 0000000000000040 CR3: 0000005f9fe22000 CR4: 00000000001407e0
[ 9627.631440] Stack:
[ 9627.631460] ffff885fa4bc3c00 ffff885f9bf41428 ffff885fa4bc3c0c ffff885fa4bc3c80
[ 9627.631515] ffff885fa4bc3c70 ffffffff811c53f3 ffff885fa4bc3c00 ffffffff00000018
[ 9627.631569] 0090007f9bcd3b08 ffff885fa4bc3c00 0000000000000000 0000000000000001
[ 9627.631680] Call Trace:
[ 9627.631703] [<ffffffff811c53f3>] ? add_disk+0x1e3/0x4a0
[ 9627.631733] [<ffffffffa0252269>] ? md_alloc+0x1e9/0x350 [md_mod]
[ 9627.631763] [<ffffffffa02523db>] ? md_probe+0xb/0x20 [md_mod]
[ 9627.631791] [<ffffffff812c0654>] ? kobj_lookup+0x104/0x170
[ 9627.631820] [<ffffffffa02523d0>] ? md_alloc+0x350/0x350 [md_mod]
[ 9627.631849] [<ffffffff811c4da8>] ? get_gendisk+0x28/0xf0
[ 9627.631877] [<ffffffff8115fb74>] ? __blkdev_get+0x114/0x3c0
[ 9627.631905] [<ffffffff8115e590>] ? bdev_direct_access+0xa0/0xa0
[ 9627.631933] [<ffffffff8115e5a0>] ? bdev_test+0x10/0x10
[ 9627.631961] [<ffffffff8115fe58>] ? blkdev_get+0x38/0x310
[ 9627.631988] [<ffffffff81160170>] ? blkdev_get_by_dev+0x40/0x40
[ 9627.632017] [<ffffffff8112b3d3>] ? do_dentry_open.isra.16+0x153/0x320
[ 9627.632046] [<ffffffff811380f3>] ? do_last.isra.51+0x323/0xd50
[ 9627.632075] [<ffffffff8111f5b3>] ? kmem_cache_alloc+0x123/0x130
[ 9627.632103] [<ffffffff8113a97f>] ? path_openat+0x7f/0x610
[ 9627.632131] [<ffffffff810f7480>] ? tlb_flush_mmu_free+0x30/0x50
[ 9627.632159] [<ffffffff810fe800>] ? unmap_region+0xb0/0xf0
[ 9627.632186] [<ffffffff8113bb3b>] ? do_filp_open+0x2b/0x90
[ 9627.632215] [<ffffffff811472ec>] ? __alloc_fd+0x7c/0x120
[ 9627.632242] [<ffffffff8112c531>] ? do_sys_open+0x121/0x210
[ 9627.632270] [<ffffffff813ea097>] ? system_call_fastpath+0x12/0x6a
[ 9627.632298] Code: 00 48 85 d2 74 73 48 85 ff 74 6e 41 56 41 55 49 89 fd 41 54 55 48 c7 c7 88 0d 74 81 53 48 89 f3 41 89 cc 48 89 d5 e8 76 15 26 00 <48> 8b 1b 48 85 db 74 08 48 89 df e8 f6 c9 ff ff 80 05 d7 86 5b
[ 9627.632557] RIP [<ffffffff8118869a>] sysfs_do_create_link_sd.isra.2+0x2a/0xb0
[ 9627.632604] RSP <ffff885f9bcd3a78>
[ 9627.632627] CR2: 0000000000000040
[ 9627.633014] ---[ end trace b7a3e9c6f05c2668 ]---
Any assumptions?
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