===================================== [ BUG: bad unlock balance detected! ] 4.9.80-g8a174b47 #39 Not tainted ------------------------------------- syz-executor0/9916 is trying to release lock ([ 53.444012] 9pnet_virtio: no channels available for device ./file0 mrt_lock) at: but there are no more locks to release! other info that might help us debug this: 2 locks held by syz-executor0/9916: #0: (sb_writers#7){.+.+.+}, at: [] file_start_write include/linux/fs.h:2621 [inline] #0: (sb_writers#7){.+.+.+}, at: [] do_sendfile+0x9ff/0xd30 fs/read_write.c:1400 #1: (&p->lock){+.+.+.}, at: [] seq_read+0xdd/0x1290 fs/seq_file.c:178 stack backtrace: CPU: 0 PID: 9916 Comm: syz-executor0 Not tainted 4.9.80-g8a174b47 #39 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801c29b7238 ffffffff81d94be9 ffffffff849b6cf8 ffff8801b9541800 ffffffff834e8f44 ffffffff849b6cf8 ffff8801b9542088 ffff8801c29b7268 ffffffff81237e84 dffffc0000000000 ffffffff849b6cf8 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 [] kernel_readv fs/splice.c:363 [inline] [] default_file_splice_read+0x43f/0x7a0 fs/splice.c:435 [] do_splice_to+0x10a/0x160 fs/splice.c:899 [] splice_direct_to_actor+0x24d/0x800 fs/splice.c:971 [] do_splice_direct+0x1a7/0x270 fs/splice.c:1080 [] do_sendfile+0x54b/0xd30 fs/read_write.c:1401 [] SYSC_sendfile64 fs/read_write.c:1456 [inline] [] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1448 [] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline] [] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384 [] entry_SYSENTER_compat+0x74/0x83 arch/x86/entry/entry_64_compat.S:127 IPVS: set_ctl: invalid protocol: 13703 39.52.93.236:60696 Ɓtpm`x/.HݼބDBC+z| IPVS: set_ctl: invalid protocol: 13703 39.52.93.236:60696 Ɓtpm`x/.HݼބDBC+fO