syzbot


BUG: soft lockup in ipv6_get_lladdr

Status: auto-closed as invalid on 2020/05/11 08:23
Reported-by: syzbot+c6f85ffe9d55dfc3404a@syzkaller.appspotmail.com
First crash: 899d, last: 899d

Sample crash report:
watchdog: BUG: soft lockup - CPU#1 stuck for 114s! [syz-executor.3:8059]
Modules linked in:
irq event stamp: 25217443
hardirqs last  enabled at (25217442): [<ffffffff86800979>] restore_regs_and_return_to_kernel+0x0/0x27
hardirqs last disabled at (25217443): [<ffffffff86801b01>] apic_timer_interrupt+0x91/0xa0 arch/x86/entry/entry_64.S:792
softirqs last  enabled at (2149298): [<ffffffff86a00645>] __do_softirq+0x645/0x9a0 kernel/softirq.c:314
softirqs last disabled at (2150475): [<ffffffff81390620>] invoke_softirq kernel/softirq.c:368 [inline]
softirqs last disabled at (2150475): [<ffffffff81390620>] irq_exit+0x160/0x1b0 kernel/softirq.c:409
CPU: 1 PID: 8059 Comm: syz-executor.3 Not tainted 4.14.163-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888043d84140 task.stack: ffff888043d88000
RIP: 0010:ipv6_get_lladdr+0x1/0x3e0 net/ipv6/addrconf.c:1775
RSP: 0018:ffff8880aed07ca0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000101 RBX: 1ffff11015da0f9a RCX: 0000000000000000
RDX: 0000000000000040 RSI: ffff8880aed07cf0 RDI: ffff8880529d2100
RBP: ffff8880aed07d40 R08: ffff888043d84140 R09: 0000000000000004
R10: 0000000000000000 R11: ffff888043d84140 R12: ffff8880a008b680
R13: ffff8880a008b800 R14: ffff8880a008b9cc R15: ffff8880529d2100
FS:  00007f917899b700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c029000 CR3: 00000000a6588000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x161/0x670 kernel/time/timer.c:1279
 expire_timers kernel/time/timer.c:1318 [inline]
 __run_timers kernel/time/timer.c:1636 [inline]
 __run_timers kernel/time/timer.c:1604 [inline]
 run_timer_softirq+0x5b7/0x1520 kernel/time/timer.c:1649
 __do_softirq+0x244/0x9a0 kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x160/0x1b0 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
 </IRQ>
RIP: 0010:preempt_schedule_irq+0xab/0x140 kernel/sched/core.c:3611
RSP: 0018:ffff888043d8f5a8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fe2d2b RBX: dffffc0000000000 RCX: 1ffff110087b0946
RDX: 0000000000000000 RSI: ffff888043d84a10 RDI: ffff888043d849bc
RBP: ffff888043d8f5c8 R08: 0000003334befe07 R09: ffff888043d84a30
R10: 0000000000000000 R11: 0000000000000000 R12: ffffed10087b0828
R13: ffff888043d84140 R14: ffffffff87f16958 R15: 0000000000000000
 retint_kernel+0x1b/0x2d
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:885 [inline]
RIP: 0010:__mutex_lock+0xe96/0x1470 kernel/locking/mutex.c:893
RSP: 0018:ffff888043d8f680 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff888043d8f7e0 R08: dffffc0000000000 R09: ffffffff89589e58
R10: ffff888043d84a10 R11: ffff888043d84140 R12: fffffbfff1352d88
R13: ffffffff89a96c40 R14: ffff888043d84140 R15: ffffffff87f595a0
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 apply_wqattrs_lock kernel/workqueue.c:3768 [inline]
 apply_workqueue_attrs+0x26/0x50 kernel/workqueue.c:3826
 alloc_and_link_pwqs kernel/workqueue.c:3942 [inline]
 __alloc_workqueue_key+0x78d/0xec0 kernel/workqueue.c:4024
 ucma_open+0x84/0x290 drivers/infiniband/core/ucma.c:1708
 misc_open+0x34f/0x480 drivers/char/misc.c:154
 chrdev_open+0x207/0x590 fs/char_dev.c:423
 do_dentry_open+0x73b/0xeb0 fs/open.c:777
 vfs_open+0x105/0x220 fs/open.c:891
 do_last fs/namei.c:3425 [inline]
 path_openat+0x8bd/0x3f70 fs/namei.c:3566
 do_filp_open+0x18e/0x250 fs/namei.c:3600
 do_sys_open+0x2c5/0x430 fs/open.c:1084
 SYSC_openat fs/open.c:1111 [inline]
 SyS_openat+0x30/0x40 fs/open.c:1105
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45af49
RSP: 002b:00007f917899ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045af49
RDX: 0000000000000002 RSI: 00000000200001c0 RDI: ffffffffffffff9c
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f917899b6d4
R13: 00000000004c8ab8 R14: 00000000004e1178 R15: 00000000ffffffff
Code: 89 df e8 33 33 f2 fb eb a4 48 8b 3c 24 be 10 00 00 00 e8 03 34 f2 fb e9 79 ff ff ff e8 f9 32 f2 fb e9 43 fe ff ff 0f 1f 40 00 55 <48> 89 e5 41 57 41 56 41 89 d6 41 55 41 54 41 52 53 48 89 fb 48 
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7154 Comm: syz-fuzzer Not tainted 4.14.163-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888087744380 task.stack: ffff888084098000
RIP: 0033:0x411e4b
RSP: 002b:000000c42004be38 EFLAGS: 00000202
RAX: 000000c420000000 RBX: 000000c425978bc0 RCX: 000000c420000900
RDX: 0000000000002cbc RSI: 00007fe52026a858 RDI: 000000c425978000
RBP: 000000c42004be80 R08: 0000000000000001 R09: 0000000000000080
R10: 0000000000000040 R11: 000000c425978bc0 R12: 000000c440900000
R13: 0000000000000044 R14: 0000000000000000 R15: 0000000000000000
FS:  000000c420040490(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe51f863000 CR3: 000000009e7e8000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2020/01/12 08:22 linux-4.14.y b0cdffaa546e 4c04afaa .config log report