===================================== [ BUG: bad unlock balance detected! ] 4.9.67-gf26d3c7 #106 Not tainted ------------------------------------- netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. syz-executor6/4161 is trying to release lock ([ 52.631565] loop: Write error at byte offset 0, length 512. blk_update_request: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, lost async page write loop: Write error at byte offset 0, length 512. blk_update_request: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, lost async page write mrt_lock) at: but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor6/4161: #0: (&p->lock){+.+.+.}, at: [] seq_read+0xdd/0x1290 fs/seq_file.c:178 stack backtrace: CPU: 1 PID: 4161 Comm: syz-executor6 Not tainted 4.9.67-gf26d3c7 #106 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d1e578e8 ffffffff81d906e9 ffffffff849ae8f8 ffff8801cdefe000 ffffffff834dec54 ffffffff849ae8f8 ffff8801cdefe888 ffff8801d1e57918 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 blk_update_request: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, lost async page write blk_update_request: I/O error, dev loop4, sector 0 qtaguid: iface_stat: create6(lo): no inet dev capability: warning: `syz-executor5' uses 32-bit capabilities (legacy support in use) qtaguid: iface_stat: create6(lo): no inet dev rfkill: input handler disabled rfkill: input handler enabled rfkill: input handler disabled rfkill: input handler enabled mmap: syz-executor3 (4311): VmData 18427904 exceed data ulimit 2045. Update limits or use boot option ignore_rlimit_data. binder: 4381:4386 ioctl 40046205 d returned -22 binder: 4381:4386 ERROR: BC_REGISTER_LOOPER called without request binder: 4381:4386 unknown command 1400526783 binder: 4396:4399 ioctl c0306201 20000fd0 returned -14 binder: 4381:4386 ioctl c0306201 20002fd0 returned -22 binder: 4381:4386 ioctl c018620b 20000fe8 returned -14 binder: 4381:4386 ioctl c0306201 20005fd0 returned -14 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_COMPLETE binder: undelivered transaction 17, process died. binder: 4381:4386 ioctl 40046205 d returned -22 binder: 4381:4386 ERROR: BC_REGISTER_LOOPER called without request binder: 4381:4397 unknown command 0 binder: 4381:4397 ioctl c0306201 20002fd0 returned -22 binder: 4381:4386 ioctl c018620b 20000fe8 returned -14 binder: send failed reply for transaction 21 to 4381:4397 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 device lo entered promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode device lo left promiscuous mode ?: renamed from tunl0 sock: sock_set_timeout: `syz-executor5' (pid 4599) tries to set negative timeout IPVS: Creating netns size=2536 id=9 sock: sock_set_timeout: `syz-executor5' (pid 4599) tries to set negative timeout 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 device gre0 entered promiscuous mode 9pnet_virtio: no channels available for device H¨ 9pnet_virtio: no channels available for device H¨ IPVS: Creating netns size=2536 id=10 9pnet_virtio: no channels available for device H¨ 9pnet_virtio: no channels available for device H¨ device gre0 entered promiscuous mode IPVS: Creating netns size=2536 id=11 device lo entered promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode device lo left 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 pktgen: kernel_thread() failed for cpu 0 pktgen: Cannot create thread for cpu 0 (-4) pktgen: kernel_thread() failed for cpu 1 nla_parse: 9 callbacks suppressed netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. pktgen: Cannot create thread for cpu 1 (-4) pktgen: Initialization failed for all threads netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor2'. 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 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=6 nlmsg_type=3131 sclass=netlink_xfrm_socket pig=4862 comm=syz-executor4 netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. SELinux: unrecognized netlink message: protocol=6 nlmsg_type=3131 sclass=netlink_xfrm_socket pig=4877 comm=syz-executor4 netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'. IPVS: Creating netns size=2536 id=12 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 IPVS: Creating netns size=2536 id=13 IPVS: Creating netns size=2536 id=14 netlink: 2 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor2'. 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 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