Ideas as to what could cause this would be appreciated.
This consistently is triggered shortly after boot (I presume due to
conmand calling fsync on a file).
Note that I'm not quite running 4.2.5, but none of the changes I have
additionally applied are to btrfs or atomics.
Let me know if there is a way for me to get you more info.
It looks like the line is:
mutex_lock(&inode->i_mutex);
atomic_inc(&root->log_batch); <<<<
full_sync = test_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
&BTRFS_I(inode)->runtime_flags);
addr2line of the trapping instruction:
addr2line -e
./work/beaglebone-poky-linux-gnueabi/linux-yocto-ikabit/4.2.5+gitAUTOINC+c29ac18888-r1/linux-beaglebone-standard-build/arch/arm/boot/vmlinux
c0217a34 -i
/home/cody/obj/y/tmp/work-shared/beaglebone/kernel-source/arch/arm/include/asm/atomic.h:194
/home/cody/obj/y/tmp/work-shared/beaglebone/kernel-source/fs/btrfs/file.c:1886
fault log:
[ 11.488382] Alignment trap: not handling instruction e1993f9f at [<c0217a34>]
[ 11.560558] Unhandled fault: alignment exception (0x001) at 0x0000026d
[ 11.607301] pgd = dc090000
[ 11.610166] [0000026d] *pgd=9c063831, *pte=00000000, *ppte=00000000
[ 11.665548] Internal error: : 1 [#1] PREEMPT ARM
[ 11.670388] Modules linked in: omaplfb(O) bufferclass_ti(O) pvrsrvkm(O)
[ 11.677341] CPU: 0 PID: 248 Comm: connmand Tainted: G O
4.2.5-yocto-standard #1
[ 11.686172] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 11.692551] task: dc00d100 ti: dc068000 task.ti: dc068000
[ 11.698219] PC is at btrfs_sync_file+0x104/0x3f4
[ 11.703051] LR is at btrfs_sync_file+0x100/0x3f4
[ 11.707883] pc : [<c0217a38>] lr : [<c0217a34>] psr: 60060013
[ 11.707883] sp : dc069e98 ip : dc069e98 fp : dc069f1c
[ 11.719897] r10: 00000000 r9 : 0000026d r8 : dd746b40
[ 11.725363] r7 : dcef8dcc r6 : 00000000 r5 : dcef8d68 r4 : 00000001
[ 11.732192] r3 : 7fffffff r2 : 00000000 r1 : 00000000 r0 : dcef8dcc
[ 11.739024] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 11.746491] Control: 10c5387d Table: 9c090019 DAC: 00000015
[ 11.752502] Process connmand (pid: 248, stack limit = 0xdc068210)
[ 11.758878] Stack: (0xdc069e98 to 0xdc06a000)
[ 11.763436] 9e80:
ffffffff 7fffffff
[ 11.771998] 9ea0: dc069f38 c014582c 0000b30b 00000000 00000000
000037f6 000081a4 d5012f68
[ 11.780559] 9ec0: 00000000 80000000 00000000 00000000 00000000
00000000 0000008d 00000000
[ 11.789121] 9ee0: 00000400 00000000 00000001 20b04e34 563924e6
dd746b40 dce2beb8 00000000
[ 11.797683] 9f00: 00000000 00000000 dc068000 00000000 dc069f54
dc069f20 c0171d00 c0217940
[ 11.806245] 9f20: ffffffff 7fffffff 00000000 dc069f38 c0145b6c
dd746b40 00000000 dd746b40
[ 11.814807] 9f40: 00000076 c000f7a4 dc069f74 dc069f58 c0171d3c
c0171c40 ffffffff 7fffffff
[ 11.823369] 9f60: 00000000 c015cc9c dc069f94 dc069f78 c0171d7c
c0171d14 00000000 bebe2bf8
[ 11.831931] 9f80: 00e64c4d b6a104d0 dc069fa4 dc069f98 c017204c
c0171d50 00000000 dc069fa8
[ 11.840492] 9fa0: c000f600 c017203c bebe2bf8 00e64c4d 00000009
bebe2bf8 0000008d 00000000
[ 11.849054] 9fc0: bebe2bf8 00e64c4d b6a104d0 00000076 00e64810
00e60cd0 00000009 00000000
[ 11.857616] 9fe0: 00000000 bebe2bd4 b6e63384 b6dcef00 60060010
00000009 044a1103 099b0303
[ 11.866199] [<c0217a38>] (btrfs_sync_file) from [<c0171d00>]
(vfs_fsync_range+0xcc/0xd4)
[ 11.874674] [<c0171d00>] (vfs_fsync_range) from [<c0171d3c>]
(vfs_fsync+0x34/0x3c)
[ 11.882600] [<c0171d3c>] (vfs_fsync) from [<c0171d7c>] (do_fsync+0x38/0x54)
[ 11.889890] [<c0171d7c>] (do_fsync) from [<c017204c>] (SyS_fsync+0x1c/0x20)
[ 11.897188] [<c017204c>] (SyS_fsync) from [<c000f600>]
(ret_fast_syscall+0x0/0x3c)
[ 11.905116] Code: e14b05fc e1a00007 eb1251f7 e1993f9f (e2833001)
[ 13.418969] ---[ end trace d7bcd93aea7d243c ]---
[ 13.442420] Kernel panic - not syncing: Fatal exception
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