ffff8801ce457930 ffffffff81d906e9 ffff8801ce457c10 0000000000000000 ffff8801cea5e290 ffff8801ce457b00 ffff8801cea5e180 ffff8801ce457b28 ffffffff8165e307 00000000000051b9[ 131.867738] ===================================== [ BUG: bad unlock balance detected! ] 4.9.67-gf26d3c7 #106 Not tainted ------------------------------------- syz-executor4/22489 is trying to release lock ( mrt_lock) at: but there are no more locks to release! other info that might help us debug this: 2 locks held by syz-executor4/22489: #0: (&f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0x9f/0xc0 fs/file.c:781 (&p->lock){+.+.+.}, at: [] seq_read+0xdd/0x1290 fs/seq_file.c:178 stack backtrace: ffff8801d8f268f0 ffff8801d8f268a0 [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] handle_userfault+0xa37/0x1300 fs/userfaultfd.c:323 [] do_anonymous_page mm/memory.c:2747 [inline] [] handle_pte_fault mm/memory.c:3488 [inline] [] __handle_mm_fault mm/memory.c:3577 [inline] [] handle_mm_fault+0x1fd1/0x2530 mm/memory.c:3614 [] __do_page_fault+0x5c2/0xd40 arch/x86/mm/fault.c:1406 [] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1469 [] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1012 [] entry_SYSCALL_64_fastpath+0x23/0xc6 CPU: 0 PID: 22489 Comm: syz-executor4 Not tainted 4.9.67-gf26d3c7 #106 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801a9b478e8 ffffffff81d906e9 ffffffff849ae8f8 ffff8801c77d8000 ffffffff834dec54 ffffffff849ae8f8 ffff8801c77d8888 ffff8801a9b47918 ffffffff812353f4 dffffc0000000000 ffffffff849ae8f8 00000000ffffffff Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_unlock_imbalance_bug+0x174/0x1a0 kernel/locking/lockdep.c:3398 [] __lock_release kernel/locking/lockdep.c:3540 [inline] [] lock_release+0x6f8/0xb80 kernel/locking/lockdep.c:3775 [] __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline] [] _raw_read_unlock+0x1a/0x50 kernel/locking/spinlock.c:255 [] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553 [] seq_read+0xa83/0x1290 fs/seq_file.c:283 [] proc_reg_read+0xef/0x170 fs/proc/inode.c:202 [] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714 [] do_loop_readv_writev fs/read_write.c:880 [inline] [] do_readv_writev+0x520/0x750 fs/read_write.c:874 [] vfs_readv+0x84/0xc0 fs/read_write.c:898 [] do_readv+0xe6/0x250 fs/read_write.c:924 [] SYSC_readv fs/read_write.c:1011 [inline] [] SyS_readv+0x27/0x30 fs/read_write.c:1008 [] entry_SYSCALL_64_fastpath+0x23/0xc6 binder: 22539:22547 ioctl 85 20416000 returned -22 binder: 22539:22547 IncRefs 0 refcount change on invalid ref 2 ret -22 binder: 22539:22547 Acquire 1 refcount change on invalid ref 4 ret -22 binder: 22539:22547 unknown command 0 device gre0 entered promiscuous mode binder: 22539:22547 ioctl c0306201 20000fd0 returned -22 binder: 22539:22562 ioctl 85 20416000 returned -22 binder: BINDER_SET_CONTEXT_MGR already set binder: 22539:22562 ioctl 40046207 0 returned -16 binder: 22539:22562 IncRefs 0 refcount change on invalid ref 2 ret -22 binder: 22539:22562 Acquire 1 refcount change on invalid ref 4 ret -22 binder: 22539:22562 unknown command 0 binder: 22539:22562 ioctl c0306201 20000fd0 returned -22 device ±BÞÓ*mqÐx”o‡3{© entered promiscuous mode device ±BÞÓ*mqÐx”o‡3{© left promiscuous mode device gre0 entered promiscuous mode IPVS: Creating netns size=2536 id=25 device gre0 entered promiscuous mode pktgen: kernel_thread() failed for cpu 0 pktgen: Cannot create thread for cpu 0 (-4) pktgen: kernel_thread() failed for cpu 1 pktgen: Cannot create thread for cpu 1 (-4) pktgen: Initialization failed for all threads SELinux: unrecognized netlink message: protocol=0 nlmsg_type=5521 sclass=netlink_route_socket pig=22917 comm=syz-executor1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=5521 sclass=netlink_route_socket pig=22917 comm=syz-executor1 9pnet_virtio: no channels available for device H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H 9pnet_virtio: no channels available for device H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H¨H IPVS: Creating netns size=2536 id=26 pktgen: kernel_thread() failed for cpu 0 pktgen: Cannot create thread for cpu 0 (-4) pktgen: kernel_thread() failed for cpu 1 pktgen: Cannot create thread for cpu 1 (-4) pktgen: Initialization failed for all threads nla_parse: 45 callbacks suppressed netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. device gre0 entered promiscuous mode device gre0 entered promiscuous mode binder: 23673:23684 BC_CLEAR_DEATH_NOTIFICATION death notification not active binder: 23673:23706 BC_DEAD_BINDER_DONE 0000000000000000 not found binder: 23673:23721 tried to acquire reference to desc 0, got 1 instead binder: 23673:23721 BC_CLEAR_DEATH_NOTIFICATION invalid ref 0 binder: 23673:23721 BC_DEAD_BINDER_DONE 0000000000000000 not found Option '9˜ŸT§' to dns_resolver key: bad/missing value Option '9˜ŸT§' to dns_resolver key: bad/missing value device gre0 entered promiscuous mode selinux_nlmsg_perm: 4 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=20147 sclass=netlink_route_socket pig=24644 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=20147 sclass=netlink_route_socket pig=24644 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=24766 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=24784 comm=syz-executor2 nla_parse: 167 callbacks suppressed netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor2'. SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=24896 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=24913 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=25046 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=25057 comm=syz-executor2