On Tue, Jan 14, 2020 at 2:56 PM syzbot <syzbot+a4a503d7f37292ae1664@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 1b851f98 Add linux-next specific files for 20200114 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=12bcbb25e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3e7d9cf7ebfa08ad > dashboard link: https://syzkaller.appspot.com/bug?extid=a4a503d7f37292ae1664 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+a4a503d7f37292ae1664@xxxxxxxxxxxxxxxxxxxxxxxxx +Lakshmi, you seem to have submitted a number of changes to this file recently. This completely breaks linux-next testing for us, every kernel crashes a few minutes after boot. 2020/01/14 14:45:00 vm-26: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:00 vm-12: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:01 vm-3: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:02 vm-8: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:03 vm-25: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:04 vm-27: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:04 VMs 0, executed 214279, cover 10140, crashes 5, repro 0 2020/01/14 14:45:05 vm-14: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:05 vm-11: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:06 vm-10: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:07 vm-0: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:08 vm-24: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:09 vm-2: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:10 vm-20: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:11 vm-7: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:12 vm-28: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:12 vm-1: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:13 vm-6: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:14 vm-4: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:14 VMs 0, executed 214279, cover 10140, crashes 17, repro 0 2020/01/14 14:45:15 vm-17: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:16 vm-16: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:16 vm-19: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:17 vm-15: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:18 vm-29: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:19 vm-21: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:20 vm-23: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:20 vm-13: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:21 vm-9: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:22 vm-5: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:23 vm-22: crash: inconsistent lock state in ima_process_queued_keys 2020/01/14 14:45:24 VMs 0, executed 214279, cover 10140, crashes 28, repro 0 2020/01/14 14:45:24 vm-18: crash: inconsistent lock state in ima_process_queued_keys > ================================ > WARNING: inconsistent lock state > 5.5.0-rc6-next-20200114-syzkaller #0 Not tainted > -------------------------------- > inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. > syz-executor.5/9563 [HC0[0]:SC1[1]:HE1:SE0] takes: > ffffffff8a03aa18 (ima_keys_lock){+.?.}, at: spin_lock > include/linux/spinlock.h:338 [inline] > ffffffff8a03aa18 (ima_keys_lock){+.?.}, at: > ima_process_queued_keys+0x4f/0x320 > security/integrity/ima/ima_asymmetric_keys.c:144 > {SOFTIRQ-ON-W} state was registered at: > lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 > __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] > _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 > spin_lock include/linux/spinlock.h:338 [inline] > ima_queue_key security/integrity/ima/ima_asymmetric_keys.c:111 [inline] > ima_post_key_create_or_update+0x234/0x470 > security/integrity/ima/ima_asymmetric_keys.c:194 > key_create_or_update+0x6b8/0xcb0 security/keys/key.c:944 > load_system_certificate_list+0x1ba/0x25e certs/system_keyring.c:161 > do_one_initcall+0x120/0x820 init/main.c:940 > do_initcall_level init/main.c:1014 [inline] > do_initcalls init/main.c:1022 [inline] > do_basic_setup init/main.c:1039 [inline] > kernel_init_freeable+0x4ca/0x570 init/main.c:1223 > kernel_init+0x12/0x1bf init/main.c:1130 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > irq event stamp: 319180 > hardirqs last enabled at (319180): [<ffffffff87ec3333>] > __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] > hardirqs last enabled at (319180): [<ffffffff87ec3333>] > _raw_spin_unlock_irq+0x23/0x80 kernel/locking/spinlock.c:199 > hardirqs last disabled at (319179): [<ffffffff87ec351a>] > __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] > hardirqs last disabled at (319179): [<ffffffff87ec351a>] > _raw_spin_lock_irq+0x3a/0x80 kernel/locking/spinlock.c:167 > softirqs last enabled at (316932): [<ffffffff882006cd>] > __do_softirq+0x6cd/0x98c kernel/softirq.c:319 > softirqs last disabled at (319177): [<ffffffff8147800b>] invoke_softirq > kernel/softirq.c:373 [inline] > softirqs last disabled at (319177): [<ffffffff8147800b>] > irq_exit+0x19b/0x1e0 kernel/softirq.c:413 > > other info that might help us debug this: > Possible unsafe locking scenario: > > CPU0 > ---- > lock(ima_keys_lock); > <Interrupt> > lock(ima_keys_lock); > > *** DEADLOCK *** > > 1 lock held by syz-executor.5/9563: > #0: ffffc90000007d50 ((&ima_key_queue_timer)){+.-.}, at: lockdep_copy_map > include/linux/lockdep.h:172 [inline] > #0: ffffc90000007d50 ((&ima_key_queue_timer)){+.-.}, at: > call_timer_fn+0xe0/0x780 kernel/time/timer.c:1394 > > stack backtrace: > CPU: 0 PID: 9563 Comm: syz-executor.5 Not tainted > 5.5.0-rc6-next-20200114-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > <IRQ> > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x197/0x210 lib/dump_stack.c:118 > print_usage_bug.cold+0x327/0x378 kernel/locking/lockdep.c:3100 > valid_state kernel/locking/lockdep.c:3111 [inline] > mark_lock_irq kernel/locking/lockdep.c:3308 [inline] > mark_lock+0xbb4/0x1220 kernel/locking/lockdep.c:3665 > mark_usage kernel/locking/lockdep.c:3565 [inline] > __lock_acquire+0x1e8e/0x4a00 kernel/locking/lockdep.c:3908 > lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 > __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] > _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 > spin_lock include/linux/spinlock.h:338 [inline] > ima_process_queued_keys+0x4f/0x320 > security/integrity/ima/ima_asymmetric_keys.c:144 > ima_timer_handler+0x15/0x20 security/integrity/ima/ima_asymmetric_keys.c:46 > call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404 > expire_timers kernel/time/timer.c:1449 [inline] > __run_timers kernel/time/timer.c:1773 [inline] > __run_timers kernel/time/timer.c:1740 [inline] > run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786 > __do_softirq+0x262/0x98c kernel/softirq.c:292 > invoke_softirq kernel/softirq.c:373 [inline] > irq_exit+0x19b/0x1e0 kernel/softirq.c:413 > exiting_irq arch/x86/include/asm/apic.h:536 [inline] > smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 > </IRQ> > RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 > [inline] > RIP: 0010:slab_alloc mm/slab.c:3313 [inline] > RIP: 0010:kmem_cache_alloc+0x283/0x710 mm/slab.c:3484 > Code: 7e 0f 85 dc fe ff ff e8 0c 3f 4d ff e9 d2 fe ff ff e8 31 aa c7 ff 48 > 83 3d 21 84 00 08 00 0f 84 51 03 00 00 48 8b 7d d0 57 9d <0f> 1f 44 00 00 > e9 68 fe ff ff 31 d2 be 35 02 00 00 48 c7 c7 2e a1 > RSP: 0018:ffffc9000641fd18 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 > RAX: 0000000000000007 RBX: 0000000000000cc0 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000286 > RBP: ffffc9000641fd80 R08: ffff8880543b22c0 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aa5f8a80 > R13: ffff8880aa5f8a80 R14: 0000000000000cc0 R15: ffff8880a8916600 > getname_flags fs/namei.c:138 [inline] > getname_flags+0xd6/0x5b0 fs/namei.c:128 > getname fs/namei.c:209 [inline] > user_path_mountpoint_at+0x29/0x50 fs/namei.c:2820 > ksys_umount+0x164/0xef0 fs/namespace.c:1683 > __do_sys_umount fs/namespace.c:1709 [inline] > __se_sys_umount fs/namespace.c:1707 [inline] > __x64_sys_umount+0x54/0x80 fs/namespace.c:1707 > do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x45d977 > Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f > 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff > ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007ffeff269038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 > RAX: ffffffffffffffda RBX: 000000000004d5f3 RCX: 000000000045d977 > RDX: 000000000000000c RSI: 0000000000000002 RDI: 00007ffeff26a170 > RBP: 000000000000003c R08: 0000000000000001 R09: 0000000001dc6940 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeff26a170 > R13: 00007ffeff26a160 R14: 0000000000000000 R15: 00007ffeff26a170 > > > --- > 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#status 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/000000000000486474059c19f4d7%40google.com.
