On Thu, Jul 5, 2018 at 6:49 AM, syzbot <syzbot+eb366f9430d25498f0f6@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and.. > git tree: bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=17d35aa4400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692 > dashboard link: https://syzkaller.appspot.com/bug?extid=eb366f9430d25498f0f6 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=149e9e0c400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17464278400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+eb366f9430d25498f0f6@xxxxxxxxxxxxxxxxxxxxxxxxx #syz dup: KASAN: stack-out-of-bounds Read in timerqueue_add > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > IPVS: ftp: loaded support on port[0] = 21 > ================================================================== > BUG: KASAN: stack-out-of-bounds in move_expired_inodes+0xcb5/0xd80 > fs/fs-writeback.c:1120 > Read of size 8 at addr ffff8801a802c750 by task kworker/u4:4/849 > > CPU: 0 PID: 849 Comm: kworker/u4:4 Not tainted 4.18.0-rc3+ #45 > 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+0x1c9/0x2b4 lib/dump_stack.c:113 > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > move_expired_inodes+0xcb5/0xd80 fs/fs-writeback.c:1120 > queue_io+0x309/0x860 fs/fs-writeback.c:1169 > wb_writeback+0xaf9/0xf80 fs/fs-writeback.c:1761 > wb_check_old_data_flush fs/fs-writeback.c:1867 [inline] > wb_do_writeback fs/fs-writeback.c:1920 [inline] > wb_workfn+0xfb7/0x1760 fs/fs-writeback.c:1949 > process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 > worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 > kthread+0x345/0x410 kernel/kthread.c:240 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > > Allocated by task 2170490192: > BUG: unable to handle kernel paging request at ffffffff8c430958 > PGD 8e6d067 P4D 8e6d067 PUD 8e6e063 PMD 0 > Oops: 0000 [#1] SMP KASAN > CPU: 0 PID: 849 Comm: kworker/u4:4 Not tainted 4.18.0-rc3+ #45 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: writeback wb_workfn (flush-8:0) > RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:201 > Code: e8 65 30 47 fe e9 b3 fd ff ff e8 5b 30 47 fe e9 55 fd ff ff 90 90 90 > 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 60 09 > 43 8b 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 00 > RSP: 0018:ffff8801d7dae930 EFLAGS: 00010006 > RAX: 00000000001fffff RBX: ffff8801a802cbb4 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffff8801d7dae938 RDI: 0000000000003ff0 > RBP: ffff8801d7dae960 R08: ffff8801d7c4e380 R09: ffffed003b5c3ec2 > R10: ffffed003b5c3ec2 R11: ffff8801dae1f617 R12: ffff8801a802c400 > R13: ffff8801a802c750 R14: ffff8801d3f30e40 R15: ffff8801a802cbb0 > FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffff8c430958 CR3: 00000001bb012000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > describe_object mm/kasan/report.c:243 [inline] > print_address_description+0xfb/0x20b mm/kasan/report.c:263 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > move_expired_inodes+0xcb5/0xd80 fs/fs-writeback.c:1120 > queue_io+0x309/0x860 fs/fs-writeback.c:1169 > wb_writeback+0xaf9/0xf80 fs/fs-writeback.c:1761 > PANIC: double fault, error_code: 0x0 > CPU: 1 PID: 8116 Comm: syz-executor725 Not tainted 4.18.0-rc3+ #45 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294 > Code: 41 > 57 > 41 89 > wb_check_old_data_flush fs/fs-writeback.c:1867 [inline] > wb_do_writeback fs/fs-writeback.c:1920 [inline] > wb_workfn+0xfb7/0x1760 fs/fs-writeback.c:1949 > process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 > cf > 41 56 > 41 55 > 49 89 > fd 41 > 54 45 > 89 cc > 53 65 > 4c 8b > 34 25 > 40 ee > 01 00 > worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 > 48 83 > e4 f0 > 48 81 > ec 60 > 03 00 > 00 48 > 8b > 45 10 > <89> > 94 24 > 80 00 > 00 00 > kthread+0x345/0x410 kernel/kthread.c:240 > 48 ba > 00 00 > 00 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > 00 00 > Modules linked in: > fc ff > df 48 > Dumping ftrace buffer: > 89 84 > (ftrace buffer empty) > 24 98 > CR2: ffffffff8c430958 > RSP: 0018:ffff8800fffffed0 EFLAGS: 00010082 > ---[ end trace 565e600e75d0194b ]--- > RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:201 > RAX: 0000000000000000 RBX: 1ffff10020000056 RCX: 0000000000000002 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620 > Code: > RBP: ffff880100000258 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: dffffc0000000000 R12: 0000000000000000 > e8 > R13: ffffffff88f92620 R14: ffff8801cf4343c0 R15: 0000000000000002 > FS: 00007f2e19c1b700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > 65 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffff8800fffffec8 CR3: 0000000008e6a000 CR4: 00000000001406e0 > 30 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > 47 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > fe > > > --- > 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/0000000000002769a90570394450%40google.com. > For more options, visit https://groups.google.com/d/optout.
