Re: kernel BUG at mm/filemap.c:238! (4.4.0-rc4)

[Jan Stancek <jstancek@redhat.com>]

On 12/07/2015 12:40 PM, Jan Stancek wrote:
> Hi,
> 
> "ADSP018" test from LTP[1] is triggering BUG_ON below reliably for me on 4.4.0-rc4.
> I'll start a bisect - if someone already sees a suspect/culprit that could narrow
> it down, please let me know.
> 
> # ./aiodio_sparse -i 4 -a 8k -w 16384k -s 65536k -n 2
> aiodio_sparse    0  TINFO  :  Dirtying free blocks
> aiodio_sparse    0  TINFO  :  Starting I/O tests
> aiodio_sparse    0  TINFO  :  Killing childrens(s)
> 
> [  637.250251] ------------[ cut here ]------------
> [  637.255404] kernel BUG at mm/filemap.c:238!
> [  637.260069] invalid opcode: 0000 [#1] SMP
> [  637.264655] Modules linked in: loop x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul iTCO_wdt iTCO_vendor_support ipmi_devintf ppdev aesni_intel lrw gf128mul glue_helper ablk_helper cryptd ipmi_ssif lpc_ich sg pcspkr shpchp i2c_i801 mfd_core ipmi_si winbond_cir parport_pc rc_core parport ipmi_msghandler video nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sr_mod sd_mod cdrom mgag200 drm_kms_helper igb syscopyarea sysfillrect sysimgblt ptp fb_sys_fops pps_core ttm dca i2c_algo_bit drm ahci libahci crc32c_intel libata i2c_core dm_mirror dm_region_hash dm_log dm_mod
> [  637.328054] CPU: 6 PID: 22523 Comm: aiodio_sparse Not tainted 4.4.0-rc4 #1
> [  637.335723] Hardware name: Intel Corporation S1200RP/S1200RP, BIOS S1200RP.86B.03.01.0002.041520151123 04/15/2015
> [  637.347173] task: ffff880437fab200 ti: ffff8804379f4000 task.ti: ffff8804379f4000
> [  637.355522] RIP: 0010:[<ffffffff811cd141>]  [<ffffffff811cd141>] delete_from_page_cache+0x81/0x90
> [  637.365433] RSP: 0018:ffff8804379f7978  EFLAGS: 00010246
> [  637.371358] RAX: 002fffff80020028 RBX: ffffea000fe71c40 RCX: 0000000000000000
> [  637.379319] RDX: ffff88043e410220 RSI: 0000000000000000 RDI: ffffea000fe71c40
> [  637.387280] RBP: ffff8804379f79a0 R08: 0000000000000000 R09: 0000000000000001
> [  637.395241] R10: 0000000000000000 R11: 0000000000000001 R12: ffff880430b543b8
> [  637.403202] R13: ffff8804379f79f0 R14: 0000000000000964 R15: 0000000000000000
> [  637.411161] FS:  00007fd344bab740(0000) GS:ffff88043e400000(0000) knlGS:0000000000000000
> [  637.420188] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  637.426598] CR2: 00007ffc755f8aef CR3: 0000000001ad6000 CR4: 00000000003406e0
> [  637.434560] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [  637.442518] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [  637.450479] Stack:
> [  637.452718]  ffffea000fe71c40 ffff880430b543b8 ffff8804379f79f0 0000000000000964
> [  637.461009]  0000000000000000 ffff8804379f79c0 ffffffff811dee66 ffffffffffffffff
> [  637.469299]  ffff8804379f7a60 ffff8804379f7b10 ffffffff811df2cb 0000000000000000
> [  637.477590] Call Trace:
> [  637.480316]  [<ffffffff811dee66>] truncate_inode_page+0x56/0x90
> [  637.486922]  [<ffffffff811df2cb>] truncate_inode_pages_range+0x3eb/0x760
> [  637.494399]  [<ffffffff811df6ac>] truncate_inode_pages_final+0x4c/0x60
> [  637.501695]  [<ffffffffa02b2537>] xfs_fs_evict_inode+0x77/0x1b0 [xfs]
> [  637.508881]  [<ffffffff8127c22f>] evict+0xaf/0x180
> [  637.514223]  [<ffffffff8127cc6f>] iput+0x1af/0x290
> [  637.519566]  [<ffffffff812763fc>] __dentry_kill+0x17c/0x1e0
> [  637.525782]  [<ffffffff812776ad>] dput+0x25d/0x310
> [  637.531126]  [<ffffffff81277470>] ? dput+0x20/0x310
> [  637.536566]  [<ffffffff8125f904>] __fput+0x1a4/0x240
> [  637.542102]  [<ffffffff8125f9de>] ____fput+0xe/0x10
> [  637.547542]  [<ffffffff810b91a7>] task_work_run+0x77/0xa0
> [  637.553565]  [<ffffffff81098fdf>] do_exit+0x33f/0xc60
> [  637.559199]  [<ffffffff8109998c>] do_group_exit+0x4c/0xc0
> [  637.565221]  [<ffffffff810a7a11>] get_signal+0x331/0x8f0
> [  637.571147]  [<ffffffff8101d3c7>] do_signal+0x37/0x680
> [  637.576878]  [<ffffffff81113ab3>] ? rcu_read_lock_sched_held+0x93/0xa0
> [  637.584160]  [<ffffffff8123303e>] ? kfree+0x1ae/0x270
> [  637.589794]  [<ffffffff8108f2e4>] ? exit_to_usermode_loop+0x33/0xac
> [  637.596785]  [<ffffffff8108f30f>] exit_to_usermode_loop+0x5e/0xac
> [  637.603584]  [<ffffffff81003d0b>] syscall_return_slowpath+0xbb/0x130
> [  637.610673]  [<ffffffff81761ada>] int_ret_from_sys_call+0x25/0x9f
> [  637.617469] Code: e8 65 3d 59 00 4c 89 ef e8 1d 72 07 00 4d 85 f6 74 06 48 89 df 41 ff d6 48 89 df e8 1a fb 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55
> [  637.639172] RIP  [<ffffffff811cd141>] delete_from_page_cache+0x81/0x90
> [  637.646464]  RSP <ffff8804379f7978>


So, according to bisect first bad commit is:

commit 68985633bccb6066bf1803e316fbc6c1f5b796d6
Author: Peter Zijlstra <peterz@infradead.org>
Date:   Tue Dec 1 14:04:04 2015 +0100

    sched/wait: Fix signal handling in bit wait helpers

    Vladimir reported getting RCU stall warnings and bisected it back to
    commit:

      743162013d40 ("sched: Remove proliferation of wait_on_bit() action functions")

    That commit inadvertently reversed the calls to schedule() and signal_pending(),
    thereby not handling the case where the signal receives while we sleep.

    Reported-by: Vladimir Murzin <vladimir.murzin@arm.com>
    Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: mark.rutland@arm.com
    Cc: neilb@suse.de
    Cc: oleg@redhat.com
    Fixes: 743162013d40 ("sched: Remove proliferation of wait_on_bit() action functions")
    Fixes: cbbce8220949 ("SCHED: add some "wait..on_bit...timeout()" interfaces.")
    Link: http://lkml.kernel.org/r/20151201130404.GL3816@twins.programming.kicks-ass.net
    Signed-off-by: Ingo Molnar <mingo@kernel.org>

which seems to me is only exposing problem elsewhere.

> 
> Regards,
> Jan
> 
> [1] https://github.com/linux-test-project/ltp
> 

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