On Mon, Dec 31, 2018 at 4:47 AM Qian Cai <cai@xxxxxx> wrote: > > Ah, it has KASAN_EXTRA. Need this patch then. > > https://lore.kernel.org/lkml/20181228020639.80425-1-cai@xxxxxx/ > > or to use GCC from the HEAD which suppose to reduce the stack-size in half. > > shrink_page_list > shrink_inactive_list > > Those things are 7k each, so 32k would be soon gone. I am not sure it's just KASAN. I reproduced stack overflow at this stack without KASAN: https://groups.google.com/forum/#!msg/syzkaller-bugs/ZaBzAJbn6i8/Py9FVlAqDQAJ Note: this was originally reported 5 months ago: https://groups.google.com/forum/#!msg/syzkaller-bugs/C7d0Hm6YcDM/nQeciKgtCgAJ so now at least in 2 releases and causes stream of induced crashes that people spent time debugging: https://groups.google.com/forum/#!msg/syzkaller-bugs/ZaBzAJbn6i8/Py9FVlAqDQAJ https://groups.google.com/forum/#!msg/syzkaller-bugs/GIpnqHiIEQg/5jzwQqqfCwAJ https://syzkaller.appspot.com/bug?id=26c906d472ea470c2cb58c77f08f964f347cbc68 https://groups.google.com/forum/#!msg/syzkaller-bugs/Ovkbsq5qd84/FHsTYlsfDAAJ most likely more of these: https://syzkaller.appspot.com#upstream > On 12/30/18 10:41 PM, syzbot wrote: > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: 195303136f19 Merge tag 'kconfig-v4.21-2' of git://git.kern.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=176c0ebf400000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=5e7dc790609552d7 > > dashboard link: https://syzkaller.appspot.com/bug?extid=ec1b7575afef85a0e5ca > > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a9a84b400000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17199bb3400000 > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+ec1b7575afef85a0e5ca@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > Kernel panic - not syncing: corrupted stack end detected inside scheduler > > CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 4.20.0+ #396 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google > > 01/01/2011 > > Workqueue: writeback wb_workfn (flush-8:0) > > Call Trace: > > __dump_stack lib/dump_stack.c:77 [inline] > > dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 > > panic+0x2ad/0x55f kernel/panic.c:189 > > schedule_debug kernel/sched/core.c:3285 [inline] > > __schedule+0x1ec6/0x1ed0 kernel/sched/core.c:3394 > > preempt_schedule_common+0x1f/0xe0 kernel/sched/core.c:3596 > > preempt_schedule+0x4d/0x60 kernel/sched/core.c:3622 > > ___preempt_schedule+0x16/0x18 > > __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] > > _raw_spin_unlock_irqrestore+0xbb/0xd0 kernel/locking/spinlock.c:184 > > spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] > > __remove_mapping+0x932/0x1af0 mm/vmscan.c:967 > > shrink_page_list+0x6610/0xc2e0 mm/vmscan.c:1461 > > shrink_inactive_list+0x77b/0x1c60 mm/vmscan.c:1961 > > shrink_list mm/vmscan.c:2273 [inline] > > shrink_node_memcg+0x7a8/0x19a0 mm/vmscan.c:2538 > > shrink_node+0x3e1/0x17f0 mm/vmscan.c:2753 > > shrink_zones mm/vmscan.c:2987 [inline] > > do_try_to_free_pages+0x3df/0x12a0 mm/vmscan.c:3049 > > try_to_free_pages+0x4d0/0xb90 mm/vmscan.c:3265 > > __perform_reclaim mm/page_alloc.c:3920 [inline] > > __alloc_pages_direct_reclaim mm/page_alloc.c:3942 [inline] > > __alloc_pages_slowpath+0xa5a/0x2db0 mm/page_alloc.c:4335 > > __alloc_pages_nodemask+0xa89/0xde0 mm/page_alloc.c:4549 > > alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2106 > > alloc_pages include/linux/gfp.h:509 [inline] > > __page_cache_alloc+0x38c/0x5b0 mm/filemap.c:924 > > pagecache_get_page+0x396/0xf00 mm/filemap.c:1615 > > find_or_create_page include/linux/pagemap.h:322 [inline] > > ext4_mb_load_buddy_gfp+0xddf/0x1e70 fs/ext4/mballoc.c:1158 > > ext4_mb_load_buddy fs/ext4/mballoc.c:1241 [inline] > > ext4_mb_regular_allocator+0x634/0x1590 fs/ext4/mballoc.c:2190 > > ext4_mb_new_blocks+0x1de3/0x4840 fs/ext4/mballoc.c:4538 > > ext4_ext_map_blocks+0x2eef/0x6180 fs/ext4/extents.c:4404 > > ext4_map_blocks+0x8f7/0x1b60 fs/ext4/inode.c:636 > > mpage_map_one_extent fs/ext4/inode.c:2480 [inline] > > mpage_map_and_submit_extent fs/ext4/inode.c:2533 [inline] > > ext4_writepages+0x2564/0x4170 fs/ext4/inode.c:2884 > > do_writepages+0x9a/0x1a0 mm/page-writeback.c:2335 > > __writeback_single_inode+0x20a/0x1660 fs/fs-writeback.c:1316 > > writeback_sb_inodes+0x71f/0x1210 fs/fs-writeback.c:1580 > > __writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1649 > > wb_writeback+0xa73/0xfc0 fs/fs-writeback.c:1758 > > oom_reaper: reaped process 7963 (syz-executor189), now anon-rss:0kB, > > file-rss:0kB, shmem-rss:0kB > > rsyslogd invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE), order=0, > > oom_score_adj=0 > > wb_check_start_all fs/fs-writeback.c:1882 [inline] > > wb_do_writeback fs/fs-writeback.c:1908 [inline] > > wb_workfn+0xee9/0x1790 fs/fs-writeback.c:1942 > > process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 > > worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 > > kthread+0x35a/0x440 kernel/kthread.c:246 > > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 > > CPU: 1 PID: 7840 Comm: rsyslogd Not tainted 4.20.0+ #396 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google > > 01/01/2011 > > Call Trace: > > __dump_stack lib/dump_stack.c:77 [inline] > > dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 > > dump_header+0x253/0x1239 mm/oom_kill.c:451 > > oom_kill_process.cold.27+0x10/0x903 mm/oom_kill.c:966 > > out_of_memory+0x8ba/0x1480 mm/oom_kill.c:1133 > > __alloc_pages_may_oom mm/page_alloc.c:3666 [inline] > > __alloc_pages_slowpath+0x230c/0x2db0 mm/page_alloc.c:4379 > > __alloc_pages_nodemask+0xa89/0xde0 mm/page_alloc.c:4549 > > alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2106 > > alloc_pages include/linux/gfp.h:509 [inline] > > __page_cache_alloc+0x38c/0x5b0 mm/filemap.c:924 > > page_cache_read mm/filemap.c:2373 [inline] > > filemap_fault+0x1595/0x25f0 mm/filemap.c:2557 > > ext4_filemap_fault+0x82/0xad fs/ext4/inode.c:6317 > > __do_fault+0x100/0x6b0 mm/memory.c:2997 > > do_read_fault mm/memory.c:3409 [inline] > > do_fault mm/memory.c:3535 [inline] > > handle_pte_fault mm/memory.c:3766 [inline] > > __handle_mm_fault+0x392f/0x5630 mm/memory.c:3890 > > handle_mm_fault+0x54f/0xc70 mm/memory.c:3927 > > do_user_addr_fault arch/x86/mm/fault.c:1475 [inline] > > __do_page_fault+0x5f6/0xd70 arch/x86/mm/fault.c:1541 > > do_page_fault+0xf2/0x7e0 arch/x86/mm/fault.c:1572 > > page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 > > RIP: 0033:0x7f00f990e1fd > > Code: Bad RIP value. > > RSP: 002b:00007f00f6eade30 EFLAGS: 00010293 > > RAX: 0000000000000fd2 RBX: 000000000111f170 RCX: 00007f00f990e1fd > > RDX: 0000000000000fff RSI: 00007f00f86e25a0 RDI: 0000000000000004 > > RBP: 0000000000000000 R08: 000000000110a260 R09: 0000000000000000 > > R10: 74616c7567657227 R11: 0000000000000293 R12: 000000000065e420 > > R13: 00007f00f6eae9c0 R14: 00007f00f9f53040 R15: 0000000000000003 > > Kernel Offset: disabled > > Rebooting in 86400 seconds.. > > > > > > --- > > This bug is generated by a bot. It may contain errors. > > See https://goo.gl/tpsmEJ for more information about syzbot. > > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > > > syzbot will keep track of this bug report. See: > > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. > > syzbot can test patches for this bug, for details see: > > https://goo.gl/tpsmEJ#testing-patches > > > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/9fe14b68-5a3c-5964-62b1-53a4ef4c0b76%40lca.pw. > For more options, visit https://groups.google.com/d/optout.
