On Tue, Jan 29, 2019 at 5:06 PM Michael S. Tsirkin <mst@xxxxxxxxxx> wrote: > > On Tue, Jan 29, 2019 at 01:22:02AM -0800, syzbot wrote: > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: 983542434e6b Merge tag 'edac_fix_for_5.0' of git://git.ker.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=17476498c00000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=505743eba4e4f68 > > dashboard link: https://syzkaller.appspot.com/bug?extid=40e28a8bd59d10ed0c42 > > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > > > Unfortunately, I don't have any reproducer for this crash yet. > > Hmm nothing obvious below. Generic corruption elsewhere? Hard to say, a silent memory corruption is definitely possible. If there is nothing obvious let's wait, maybe syzbot will come up with a repro or we get more such hangs so that it will be possible to rule out flakes/corruptions. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+40e28a8bd59d10ed0c42@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > protocol 88fb is buggy, dev hsr_slave_1 > > protocol 88fb is buggy, dev hsr_slave_0 > > protocol 88fb is buggy, dev hsr_slave_1 > > protocol 88fb is buggy, dev hsr_slave_0 > > protocol 88fb is buggy, dev hsr_slave_1 > > INFO: task syz-executor5:9417 blocked for more than 140 seconds. > > Not tainted 5.0.0-rc3+ #48 > > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > > syz-executor5 D27576 9417 8469 0x00000004 > > Call Trace: > > context_switch kernel/sched/core.c:2831 [inline] > > __schedule+0x897/0x1e60 kernel/sched/core.c:3472 > > schedule+0xfe/0x350 kernel/sched/core.c:3516 > > protocol 88fb is buggy, dev hsr_slave_0 > > protocol 88fb is buggy, dev hsr_slave_1 > > schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 > > __mutex_lock_common kernel/locking/mutex.c:1002 [inline] > > __mutex_lock+0xa3b/0x1670 kernel/locking/mutex.c:1072 > > mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 > > vhost_init_device_iotlb+0x124/0x280 drivers/vhost/vhost.c:1606 > > vhost_net_set_features drivers/vhost/net.c:1674 [inline] > > vhost_net_ioctl+0x1282/0x1c00 drivers/vhost/net.c:1739 > > vfs_ioctl fs/ioctl.c:46 [inline] > > file_ioctl fs/ioctl.c:509 [inline] > > do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 > > ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 > > __do_sys_ioctl fs/ioctl.c:720 [inline] > > __se_sys_ioctl fs/ioctl.c:718 [inline] > > __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 > > do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 > > protocol 88fb is buggy, dev hsr_slave_0 > > protocol 88fb is buggy, dev hsr_slave_1 > > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > RIP: 0033:0x458099 > > Code: Bad RIP value. > > RSP: 002b:00007efd7ca9bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 > > RDX: 0000000020000080 RSI: 000000004008af00 RDI: 0000000000000003 > > RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007efd7ca9c6d4 > > R13: 00000000004c295b R14: 00000000004d5280 R15: 00000000ffffffff > > INFO: task syz-executor5:9418 blocked for more than 140 seconds. > > Not tainted 5.0.0-rc3+ #48 > > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > > syz-executor5 D27800 9418 8469 0x00000004 > > Call Trace: > > context_switch kernel/sched/core.c:2831 [inline] > > __schedule+0x897/0x1e60 kernel/sched/core.c:3472 > > schedule+0xfe/0x350 kernel/sched/core.c:3516 > > schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 > > __mutex_lock_common kernel/locking/mutex.c:1002 [inline] > > __mutex_lock+0xa3b/0x1670 kernel/locking/mutex.c:1072 > > mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 > > vhost_net_set_owner drivers/vhost/net.c:1697 [inline] > > vhost_net_ioctl+0x426/0x1c00 drivers/vhost/net.c:1754 > > vfs_ioctl fs/ioctl.c:46 [inline] > > file_ioctl fs/ioctl.c:509 [inline] > > do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 > > ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 > > __do_sys_ioctl fs/ioctl.c:720 [inline] > > __se_sys_ioctl fs/ioctl.c:718 [inline] > > __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 > > do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 > > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > RIP: 0033:0x458099 > > Code: Bad RIP value. > > RSP: 002b:00007efd7ca7ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 > > RDX: 0000000000000000 RSI: 000040010000af01 RDI: 0000000000000003 > > RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007efd7ca7b6d4 > > R13: 00000000004c33a4 R14: 00000000004d5e80 R15: 00000000ffffffff > > > > Showing all locks held in the system: > > 1 lock held by khungtaskd/1040: > > #0: 00000000b7479fbe (rcu_read_lock){....}, at: > > debug_show_all_locks+0xc6/0x41d kernel/locking/lockdep.c:4389 > > 1 lock held by rsyslogd/8285: > > #0: 000000006d9ccf7d (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1b3/0x1f0 > > fs/file.c:795 > > 2 locks held by getty/8406: > > #0: 00000000052e805b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 > > drivers/tty/tty_ldsem.c:341 > > #1: 00000000b90dc267 (&ldata->atomic_read_lock){+.+.}, at: > > n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 > > 2 locks held by getty/8407: > > #0: 000000009fdef632 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 > > drivers/tty/tty_ldsem.c:341 > > #1: 00000000ff2b1a16 (&ldata->atomic_read_lock){+.+.}, at: > > n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 > > 2 locks held by getty/8408: > > #0: 00000000e48a8e78 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 > > drivers/tty/tty_ldsem.c:341 > > #1: 000000008fcf2060 (&ldata->atomic_read_lock){+.+.}, at: > > n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 > > 2 locks held by getty/8409: > > #0: 0000000063f3f4f5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 > > drivers/tty/tty_ldsem.c:341 > > #1: 000000001dc973ca (&ldata->atomic_read_lock){+.+.}, at: > > n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 > > 2 locks held by getty/8410: > > #0: 00000000f3c14150 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 > > drivers/tty/tty_ldsem.c:341 > > #1: 000000007987cec5 (&ldata->atomic_read_lock){+.+.}, at: > > n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 > > 2 locks held by getty/8411: > > #0: 00000000d04f4305 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 > > drivers/tty/tty_ldsem.c:341 > > #1: 000000003f47e3a6 (&ldata->atomic_read_lock){+.+.}, at: > > n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 > > 2 locks held by getty/8412: > > #0: 0000000082430560 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 > > drivers/tty/tty_ldsem.c:341 > > #1: 0000000094609d81 (&ldata->atomic_read_lock){+.+.}, at: > > n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 > > 2 locks held by syz-executor5/9417: > > #0: 0000000020a0f0a1 (&dev->mutex#4){+.+.}, at: vhost_net_set_features > > drivers/vhost/net.c:1668 [inline] > > #0: 0000000020a0f0a1 (&dev->mutex#4){+.+.}, at: > > vhost_net_ioctl+0x204/0x1c00 drivers/vhost/net.c:1739 > > #1: 00000000a7b5872b (&vq->mutex){+.+.}, at: > > vhost_init_device_iotlb+0x124/0x280 drivers/vhost/vhost.c:1606 > > 1 lock held by syz-executor5/9418: > > #0: 0000000020a0f0a1 (&dev->mutex#4){+.+.}, at: vhost_net_set_owner > > drivers/vhost/net.c:1697 [inline] > > #0: 0000000020a0f0a1 (&dev->mutex#4){+.+.}, at: > > vhost_net_ioctl+0x426/0x1c00 drivers/vhost/net.c:1754 > > 1 lock held by vhost-9408/9413: > > > > ============================================= > > > > NMI backtrace for cpu 0 > > CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc3+ #48 > > 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+0x1db/0x2d0 lib/dump_stack.c:113 > > nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 > > nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 > > arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 > > trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] > > check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] > > watchdog+0xbbb/0x1170 kernel/hung_task.c:287 > > kthread+0x357/0x430 kernel/kthread.c:246 > > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 > > Sending NMI from CPU 0 to CPUs 1: > > NMI backtrace for cpu 1 > > CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.0.0-rc3+ #48 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > Google 01/01/2011 > > Workqueue: bat_events batadv_nc_worker > > RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x15/0x20 kernel/kcov.c:174 > > Code: 00 48 89 e5 48 8b 4d 08 e8 18 ff ff ff 5d c3 66 0f 1f 44 00 00 55 40 > > 0f b6 d6 40 0f b6 f7 bf 01 00 00 00 48 89 e5 48 8b 4d 08 <e8> f6 fe ff ff 5d > > c3 0f 1f 40 00 55 0f b7 d6 0f b7 f7 bf 03 00 00 > > RSP: 0018:ffff8880a947f8a8 EFLAGS: 00000246 > > RAX: ffff8880a94701c0 RBX: ffff8880a05efc40 RCX: ffffffff87d36c97 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 > > RBP: ffff8880a947f8a8 R08: ffff8880a94701c0 R09: ffffed1015ce5b90 > > R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: 0000000000000000 > > R13: 0000000000000000 R14: 000000000000019e R15: dffffc0000000000 > > FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: ffffffffff600400 CR3: 00000000a005a000 CR4: 00000000001426e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > Call Trace: > > rcu_read_unlock include/linux/rcupdate.h:657 [inline] > > batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:423 [inline] > > batadv_nc_worker+0x2f7/0x920 net/batman-adv/network-coding.c:730 > > process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 > > worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 > > kthread+0x357/0x430 kernel/kthread.c:246 > > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 > > > > > > --- > > 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. > > -- > 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/20190129105957-mutt-send-email-mst%40kernel.org. > For more options, visit https://groups.google.com/d/optout. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
