On 20.12.2017 21:16, David Ahern wrote:
> I am still seeing this problem on 4.15.0-rc3
This is a known problem and the offending commit is this one
ce8ea7cc6eb3 ("btrfs: don't call btrfs_start_delalloc_roots in
flushoncommit") and this manifests only if you have mounted with
flushoncommit mount option. A fix is unlikely to land for 4.15
>
>
> On 11/17/17 12:55 PM, David Ahern wrote:
>> I see a backtrace booting 4.14+ on a mellanox switch. The trace is due
>> to the WARN_ON in __writeback_inodes_sb_nr.
>>
>> [ 40.958590] WARNING: CPU: 0 PID: 183 at
>> /home/dsa/kernel-2.git/fs/fs-writeback.c:2339
>> __writeback_inodes_sb_nr+0x8a/0x90
>> [ 40.958593] Modules linked in: ebtable_filter ebtables ip6table_raw
>> ip6table_mangle ip6table_filter ip6_tables iTCO_wdt iTCO_vendor_support
>> coretemp x86_pkg_temp_thermal kvm_intel kvm irqbypass lpc_ich mfd_core
>> battery mei_me mei shpchp lm75 regmap_i2c pmbus pmbus_core i2c_dev
>> i2c_mux k10temp mpls_iptunnel mpls_router ip_tunnel at24 tun
>> br_netfilter bonding loop autofs4 dm_mod dax crc32c_intel i2c_i801
>> i2c_core thermal mlxsw_spectrum psample parman bridge stp llc mlxsw_pci
>> mlxsw_core mlxfw devlink e1000e hwmon
>> [ 40.958664] CPU: 0 PID: 183 Comm: btrfs-transacti Not tainted 4.14.0+ #38
>> [ 40.958666] Hardware name: Mellanox Technologies Ltd. Mellanox
>> switch/Mellanox switch, BIOS 4.6.5 05/21/2015
>> [ 40.958669] task: ffff8803db266540 task.stack: ffffc90000344000
>> [ 40.958675] RIP: 0010:__writeback_inodes_sb_nr+0x8a/0x90
>> [ 40.958677] RSP: 0018:ffffc90000347dc8 EFLAGS: 00010246
>> [ 40.958681] RAX: 0000000000000000 RBX: ffff88040a641800 RCX:
>> 0000000000000000
>> [ 40.958683] RDX: 0000000000000002 RSI: 00000000000045a7 RDI:
>> ffffc90000347e10
>> [ 40.958685] RBP: ffffc90000347e20 R08: 0000000000000003 R09:
>> ffffc90000347dd0
>> [ 40.958687] R10: ffff8803db287000 R11: 0000000000000000 R12:
>> ffffc90000347dcc
>> [ 40.958689] R13: ffff8804015e7a00 R14: ffff8803dade2bc8 R15:
>> ffff880400a68000
>> [ 40.958692] FS: 0000000000000000(0000) GS:ffff88041dc00000(0000)
>> knlGS:0000000000000000
>> [ 40.958695] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 40.958697] CR2: 00005602d78aad50 CR3: 0000000001e09002 CR4:
>> 00000000001606f0
>> [ 40.958699] Call Trace:
>> [ 40.958710] writeback_inodes_sb+0x27/0x30
>> [ 40.958719] btrfs_commit_transaction+0x7b2/0x8e0
>> [ 40.958723] ? start_transaction+0x9e/0x450
>> [ 40.958728] transaction_kthread+0x177/0x1b0
>> [ 40.958735] kthread+0x11d/0x150
>> [ 40.958740] ? btrfs_cleanup_transaction+0x4f0/0x4f0
>> [ 40.958744] ? kthread_associate_blkcg+0xb0/0xb0
>> [ 40.958751] ret_from_fork+0x24/0x30
>> [ 40.958754] Code: 8b 42 70 48 85 c0 74 23 4c 89 ce 48 89 df 41 0f b6
>> d3 e8 fa fc ff ff 4c 89 e6 48 89 df e8 8f de ff ff 48 83 c4 48 5b 41 5c
>> 5d c3 <0f> ff eb d9 66 90 0f 1f 44 00 00 55 31 c9 48 89 e5 e8 60 ff ff
>> [ 40.958826] ---[ end trace defabeb7afdfd414 ]---
>>
>>
>> Tree is DaveM's net-next, but it was recently merged with Linus' tree at:
>>
>> commit 6363b3f3ac5be096d08c8c504128befa0c033529
>> Merge: 1b6115fbe3b3 6297fabd93f9
>> Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
>> Date: Wed Nov 15 15:12:28 2017 -0800
>>
>> Merge tag 'ipmi-for-4.15' of git://github.com/cminyard/linux-ipmi
>>
>
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