| TITLE: WARNING: bad unlock balance in ipmr_mfc_seq_stop |
| |
| [ 163.443279] ===================================== |
| [ 163.448095] WARNING: bad unlock balance detected! |
| [ 163.452916] 4.15.0-rc3+ #217 Not tainted |
| [ 163.456956] ------------------------------------- |
| [ 163.461783] syz-executor3/19522 is trying to release lock (mrt_lock) at: |
| [ 163.468622] [<00000000adc671f1>] ipmr_mfc_seq_stop+0xe1/0x130 |
| [ 163.474487] but there are no more locks to release! |
| [ 163.479485] |
| [ 163.479485] other info that might help us debug this: |
| [ 163.486133] 2 locks held by syz-executor3/19522: |
| [ 163.490861] #0: (&f->f_pos_lock){+.+.}, at: [<00000000cd36f0f9>] __fdget_pos+0x131/0x1a0 |
| [ 163.499256] #1: (&p->lock){+.+.}, at: [<00000000c93d2595>] seq_lseek+0x58/0x3c0 |
| [ 163.506866] |
| [ 163.506866] stack backtrace: |
| [ 163.511343] CPU: 0 PID: 19522 Comm: syz-executor3 Not tainted 4.15.0-rc3+ #217 |
| [ 163.518677] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 |
| [ 163.528007] Call Trace: |
| [ 163.530573] dump_stack+0x194/0x257 |
| [ 163.534176] ? arch_local_irq_restore+0x53/0x53 |
| [ 163.538823] ? ipmr_mfc_seq_stop+0xe1/0x130 |
| [ 163.543121] print_unlock_imbalance_bug+0x12f/0x140 |
| [ 163.548118] lock_release+0x5f9/0xda0 |
| [ 163.551899] ? ipmr_mfc_seq_stop+0xe1/0x130 |
| [ 163.556206] ? lock_downgrade+0x980/0x980 |
| [ 163.560332] ? iterate_fd+0x3f0/0x3f0 |
| [ 163.564105] ? lock_release+0xda0/0xda0 |
| [ 163.568060] ? do_raw_spin_trylock+0x190/0x190 |
| [ 163.572617] ? memcpy+0x45/0x50 |
| [ 163.575872] ? seq_puts+0xb5/0x130 |
| [ 163.579392] _raw_read_unlock+0x1a/0x30 |
| [ 163.583341] ipmr_mfc_seq_stop+0xe1/0x130 |
| [ 163.587462] traverse+0x3bc/0xa00 |
| [ 163.590894] ? seq_hlist_next+0xc0/0xc0 |
| [ 163.594846] seq_lseek+0x136/0x3c0 |
| [ 163.598361] ? traverse+0xa00/0xa00 |
| [ 163.601961] proc_reg_llseek+0xf1/0x160 |
| [ 163.605913] ? trace_hardirqs_on_caller+0x421/0x5c0 |
| [ 163.610902] ? proc_reg_read+0x170/0x170 |
| [ 163.614944] SyS_lseek+0xf1/0x170 |
| [ 163.618373] entry_SYSCALL_64_fastpath+0x1f/0x96 |
