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Subjectbtrfs zero divide (was: Re: Linux 3.10 problem reports (yes, plural))
On Tue, 30 Jul 2013, Thorsten Glaser wrote:
> NEW problem: btrfs doesn’t work at all. I had to reboot my
> buildd into 3.2 using echo s/u/s/o >/proc/sysrq-trigger as
> the attempt to mount it left the system hanging there.

> [ 0.000000] Linux version 3.10-1-m68k (debian-kernel@lists.debian.org) (gcc version 4.8.1 (Debian 4.8.1-7+m68k.1) ) #1 Debian 3.10.3-1 (2013-07-27)

> [ 6.720000] bio: create slab <bio-1> at 1
> [ 6.740000] Btrfs loaded
> [ 6.830000] device label ara5-butter devid 1 transid 376178 /dev/nfhd8p3
> [ 7.150000] EXT4-fs (nfhd8p1): mounted filesystem with ordered data mode. Opts: (null)
> [ 14.520000] udevd[228]: starting version 175
> [ 17.820000] device label ara5-butter devid 1 transid 376178 /dev/nfhd8p3
> [ 20.850000] Adding 3670012k swap on /dev/nfhd8p2. Priority:-1 extents:1 across:3670012k
> [ 21.380000] EXT4-fs (nfhd8p1): re-mounted. Opts: (null)
> [ 31.300000] EXT4-fs (nfhd8p1): re-mounted. Opts: errors=remount-ro
> [ 38.460000] device label ara5-butter devid 1 transid 376178 /dev/nfhd8p3
> [ 38.530000] btrfs: setting nodatacow, compression disabled
> [ 38.540000] btrfs: enabling auto recovery
> [ 38.570000] btrfs: disk space caching is enabled
> [ 38.600000] *** ZERO DIVIDE *** FORMAT=2
> [ 38.630000] Current process id is 722
> [ 38.660000] BAD KERNEL TRAP: 00000000
> [ 38.680000] Modules linked in: evdev mac_hid ext4 crc16 jbd2 mbcache btrfs xor lzo_compress zlib_deflate raid6_pq crc32c libcrc32c
> [ 38.730000] PC: [<319535b2>] __btrfs_map_block+0x11c/0x119a [btrfs]

Woops, adding the btrfs devs to CC.

> [ 38.770000] SR: 2000 SP: 30c1fab4 a2: 30f0faf0
> [ 38.800000] d0: 00000000 d1: 00001000 d2: 00000000 d3: 00000000
> [ 38.830000] d4: 00010000 d5: 00000000 a0: 3085c72c a1: 3085c72c
> [ 38.850000] Process mount (pid: 722, task=30f0faf0)
> [ 38.870000] Frame format=2 instr addr=319535ae
> [ 38.880000] Stack from 30c1faec:
> [ 38.880000] 00000000 00000020 00000000 00001000 00000000 01401000 30253928 300ffc00
> [ 38.880000] 00a843ac 3026f640 00000000 00010000 0009e250 00d106c0 00011220 00000000
> [ 38.880000] 00001000 301c6830 0009e32a 000000ff 00000009 3085c72c 00000000 00000000
> [ 38.880000] 30c1fd14 00000000 00000020 00000000 30c1fd14 0009e26c 00000020 00000003
> [ 38.880000] 00000000 0009dd8a 300b0b6c 30253928 00a843ac 00001000 00000000 00000000
> [ 38.880000] 0000a008 3194e76a 30253928 00a843ac 00001000 00000000 00000000 00000002
> [ 39.190000] Call Trace: [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 39.210000] [<00010000>] res_func+0x1020/0x141a
> [ 39.250000] [<0009e250>] bvec_alloc+0xa2/0xbe
> [ 39.270000] [<00011220>] sasin+0x87c/0x944
> [ 39.290000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 39.330000] [<0009e32a>] bio_alloc_bioset+0xbe/0x12e
> [ 39.360000] [<0009e26c>] bio_alloc_bioset+0x0/0x12e
> [ 39.380000] [<0009dd8a>] bio_add_page+0x4a/0x58
> [ 39.420000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 39.470000] [<0000a008>] via_nubus_irq+0x1c/0xa2
> [ 39.500000] [<3194e76a>] submit_extent_page.isra.44+0x170/0x1bc [btrfs]
> [ 39.530000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 39.560000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 39.600000] [<31959778>] btrfs_map_bio+0x60/0x48c [btrfs]
> [ 39.630000] [<31931b72>] btree_submit_bio_hook+0x0/0xae [btrfs]
> [ 39.660000] [<3194eaa0>] end_bio_extent_readpage+0x0/0x69c [btrfs]
> [ 39.710000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 39.730000] [<31931944>] btrfs_bio_wq_end_io+0x16/0x50 [btrfs]
> [ 39.760000] [<31931bce>] btree_submit_bio_hook+0x5c/0xae [btrfs]
> [ 39.780000] [<3194bd36>] submit_one_bio+0x7c/0xb2 [btrfs]
> [ 39.810000] [<3194f174>] __extent_read_full_page+0x0/0x70a [btrfs]
> [ 39.830000] [<00058828>] unlock_page+0x0/0x26
> [ 39.840000] [<31951736>] read_extent_buffer_pages+0x1a8/0x218 [btrfs]
> [ 39.890000] [<00027d81>] devkmsg_read+0x213/0x39a
> [ 39.930000] [<31959006>] btrfs_num_copies+0x0/0x142 [btrfs]
> [ 39.970000] [<31930a66>] btree_read_extent_buffer_pages.constprop.52+0x42/0xca [btrfs]
> [ 40.030000] [<3192f7c2>] btree_get_extent+0x0/0x102 [btrfs]
> [ 40.060000] [<00027d81>] devkmsg_read+0x213/0x39a
> [ 40.090000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 40.100000] [<3193221e>] read_tree_block+0x38/0x48 [btrfs]
> [ 40.130000] [<00027d81>] devkmsg_read+0x213/0x39a
> [ 40.140000] [<319321e6>] read_tree_block+0x0/0x48 [btrfs]
> [ 40.170000] [<31933d00>] open_ctree+0xe80/0x15e6 [btrfs]
> [ 40.200000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 40.220000] [<00027d81>] devkmsg_read+0x213/0x39a
> [ 40.230000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 40.260000] [<000f280a>] resource_string.isra.12+0x2b4/0x2ee
> [ 40.280000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 40.320000] [<00001000>] kernel_pg_dir+0x0/0x1000
> [ 40.350000] [<000e59ba>] disk_name+0x72/0x80
> [ 40.360000] [<0000aff0>] mac_hwclk.part.0+0xe6/0x174
> [ 40.390000] [<31913ede>] btrfs_mount+0x450/0x73e [btrfs]
> [ 40.410000] [<00006ff0>] amiga_get_hardware_list+0x19e/0x44a
> [ 40.460000] [<0007acc0>] __kmalloc+0x14/0xac
> [ 40.500000] [<000675c6>] kstrdup+0x36/0x48
> [ 40.530000] [<0007fae4>] mount_fs+0x1c/0xc8
> [ 40.560000] [<0008fec8>] vfs_kern_mount+0x44/0xbe
> [ 40.580000] [<0008f55c>] put_filesystem+0x0/0x10
> [ 40.620000] [<00085e7e>] kern_path+0x0/0x3c
> [ 40.640000] [<00091a96>] do_mount+0x61e/0x6e0
> [ 40.670000] [<0007a73e>] kfree+0x0/0xa2
> [ 40.680000] [<0009144a>] copy_mount_string+0x0/0x2e
> [ 40.700000] [<00091bd0>] SyS_mount+0x78/0xb0
> [ 40.730000] [<00002614>] syscall+0x8/0xc
> [ 40.750000] [<0008c018>] __d_move+0x46/0x1a8
> [ 40.770000]
> [ 40.790000] Code: 222e ff74 2a2e ff5c 2c2e ff60 4c45 1402 <2d40> ff64 2d41 ff68 2205 4c2e 1800 ff68 4c04 0800 2041 d1c0 2206 4c2e 1400 ff68
> [ 40.830000] Disabling lock debugging due to kernel taint

0: 222e ff74 movel %fp@(-140),%d1
4: 2a2e ff5c movel %fp@(-164),%d5
8: 2c2e ff60 movel %fp@(-160),%d6
c: 4c45 1402 < divul %d5,%d2,%d1 >
10: 2d40 ff64 movel %d0,%fp@(-156)
14: 2d41 ff68 movel %d1,%fp@(-152)
18: 2205 movel %d5,%d1
1a: 4c2e 1800 ff68 mulsl %fp@(-152),%d1
20: 4c04 0800 mulsl %d4,%d0
24: 2041 moveal %d1,%a0
26: d1c0 addal %d0,%a0
28: 2206 movel %d6,%d1
2a: 4c2e 1400 ff68 mulul %fp@(-152),%d0,%d1

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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