On Thu, Apr 21, 2016 at 11:10 AM, Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx> wrote: > 2016-04-21 11:25 GMT+03:00 Dmitry Vyukov <dvyukov@xxxxxxxxxx>: >> On Wed, Apr 20, 2016 at 11:14 PM, Tejun Heo <tj@xxxxxxxxxx> wrote: >>> Hello, Dmitry. >>> >>> On Mon, Apr 18, 2016 at 11:44:11AM +0200, Dmitry Vyukov wrote: >>> >>>> general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN >>> ... >>>> RIP: 0010:[<ffffffff818884d2>] [<ffffffff818884d2>] >>>> locked_inode_to_wb_and_lock_list+0xa2/0x750 >>>> RSP: 0018:ffff88006cdaf7d0 EFLAGS: 00010246 >>>> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88006ccf2050 >>>> RDX: 0000000000000000 RSI: 000000114c8a8484 RDI: 0000000000000286 >>>> RBP: ffff88006cdaf820 R08: ffff88006ccf1840 R09: 0000000000000000 >>>> R10: 000229915090805f R11: 0000000000000001 R12: ffff88006a72f5e0 >>>> R13: dffffc0000000000 R14: ffffed000d4e5eed R15: ffffffff8830cf40 >>>> FS: 0000000000000000(0000) GS:ffff88006d500000(0000) knlGS:0000000000000000 >>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>>> CR2: 0000000003301bf8 CR3: 000000006368f000 CR4: 00000000000006e0 >>>> DR0: 0000000000001ec9 DR1: 0000000000000000 DR2: 0000000000000000 >>>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 >>>> Stack: >>>> ffff88006a72f680 ffff88006a72f768 ffff8800671230d8 03ff88006cdaf948 >>>> ffff88006a72f668 ffff88006a72f5e0 ffff8800671230d8 ffff88006cdaf948 >>>> ffff880065b90cc8 ffff880067123100 ffff88006cdaf970 ffffffff8188e12e >>>> Call Trace: >>>> [< inline >] inode_to_wb_and_lock_list fs/fs-writeback.c:309 >>>> [<ffffffff8188e12e>] writeback_sb_inodes+0x4de/0x1250 fs/fs-writeback.c:1554 >>>> [<ffffffff8188efa4>] __writeback_inodes_wb+0x104/0x1e0 fs/fs-writeback.c:1600 >>>> [<ffffffff8188f9ae>] wb_writeback+0x7ce/0xc90 fs/fs-writeback.c:1709 >>>> [< inline >] wb_do_writeback fs/fs-writeback.c:1844 >>>> [<ffffffff81891079>] wb_workfn+0x2f9/0x1000 fs/fs-writeback.c:1884 >>>> [<ffffffff813bcd1e>] process_one_work+0x78e/0x15c0 kernel/workqueue.c:2094 >>>> [<ffffffff813bdc2b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2228 >>>> [<ffffffff813cdeef>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303 >>>> [<ffffffff867bc5d2>] ret_from_fork+0x22/0x50 arch/x86/entry/entry_64.S:392 >>>> Code: 05 94 4a a8 06 85 c0 0f 85 03 03 00 00 e8 07 15 d0 ff 41 80 3e >>>> 00 0f 85 64 06 00 00 49 8b 9c 24 88 01 00 00 48 89 d8 48 c1 e8 03 <42> >>>> 80 3c 28 00 0f 85 17 06 00 00 48 8b 03 48 83 c0 50 48 39 c3 >>>> RIP [< inline >] wb_get include/linux/backing-dev-defs.h:212 >>>> RIP [<ffffffff818884d2>] locked_inode_to_wb_and_lock_list+0xa2/0x750 >>>> fs/fs-writeback.c:281 >>>> RSP <ffff88006cdaf7d0> >>> >>> Man, that's a beautiful trace w/ decoding of inline functions. When >>> did we start doing that? Is there a specific config option for this? >> >> Thanks! :) >> I use this script for symbolization: >> https://github.com/google/sanitizers/blob/master/address-sanitizer/tools/kasan_symbolize.py > > BTW, it would be nice to have that script in kernel tree, instead of > scripts/decode_stacktrace.sh which > is far less advanced. I am all for it! We have 2 minor, unresolved bugs in the script: https://github.com/google/sanitizers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+kasan_symbolize It would be good to resolve them before submitting it to kernel tree. But I am not particularly experienced in Python. +Andrey Konovalov will be able to do it in autumn. If anybody is willing to take it earlier, you are welcome (please drop a note to https://github.com/google/sanitizers/issues/674 to coordinate efforts). >> It invokes addr2line to provide file:line info, adds inline frames, >> strips ? frames (are they ever useful?) and strips timestamps. >> You just need to pipe a report through it. It assumes that vmlinux is >> in the current dir, but you can override it with --linux flag. >> >> It can also insert actual source lines into a report (amount of >> context is controlled with flags), for example: >> >> >> Call Trace: >> [< inline >] khugepaged_scan_pmd include/linux/uaccess.h:9 >> 8 { >> 9 current->pagefault_disabled++; >> 10 } >> [< inline >] khugepaged_scan_mm_slot mm/huge_memory.c:2716 >> 2715 hend); >> 2716 ret = khugepaged_scan_pmd(mm, vma, >> 2717 >> khugepaged_scan.address, >> [< inline >] khugepaged_do_scan mm/huge_memory.c:2796 >> 2795 pass_through_head < 2) >> 2796 progress += >> khugepaged_scan_mm_slot(pages - progress, >> 2797 &hpage); >> [<ffffffff81790b33>] khugepaged+0x993/0x48e0 mm/huge_memory.c:2831 >> 2830 while (!kthread_should_stop()) { >> 2831 khugepaged_do_scan(); >> 2832 khugepaged_wait_work(); >> [<ffffffff813c195f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303 >> 1302 add_wait_queue(k->waitq, &wait); >> 1303 __set_current_state(TASK_INTERRUPTIBLE); >> 1304 } >> [<ffffffff866d1b2f>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:405 >> 404 SWAPGS >> 405 jmp restore_regs_and_iret >> 406 END(ret_from_fork) -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
