Messages in this thread |  | | Date | Mon, 02 Apr 2018 19:01:02 -0700 | Subject | WARNING: bad unlock balance in xfs_iunlock | From | syzbot <> |
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Hello,
syzbot hit the following crash on upstream commit 86bbbebac1933e6e95e8234c4f7d220c5ddd38bc (Mon Apr 2 18:47:07 2018 +0000) Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=84a67953651a971809ba
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5719304272084992 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5767783983874048 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5643378645532672 Kernel config: https://syzkaller.appspot.com/x/.config?id=6801295859785128502 compiler: gcc (GCC) 7.1.1 20170620
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000000005e445429: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000000c1c426da: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ XFS (loop0): metadata I/O error in "xfs_trans_read_buf_map" at daddr 0x1 len 1 error 117
===================================== WARNING: bad unlock balance detected! 4.16.0+ #11 Not tainted ------------------------------------- syzkaller109734/4463 is trying to release lock (&xfs_nondir_ilock_class) at: [<ffffffff8276589f>] mrunlock_excl fs/xfs/mrlock.h:74 [inline] [<ffffffff8276589f>] xfs_iunlock+0x36f/0x4a0 fs/xfs/xfs_inode.c:329 but there are no more locks to release!
other info that might help us debug this: 2 locks held by syzkaller109734/4463: #0: 00000000b4cfce0b (&type->s_umount_key#36/1){+.+.}, at: alloc_super fs/super.c:211 [inline] #0: 00000000b4cfce0b (&type->s_umount_key#36/1){+.+.}, at: sget_userns+0x3b2/0xe60 fs/super.c:502 #1: 00000000d8e8aeed (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1595 [inline] #1: 00000000d8e8aeed (sb_internal#2){.+.+}, at: xfs_trans_alloc+0x349/0x430 fs/xfs/xfs_trans.c:264
stack backtrace: CPU: 1 PID: 4463 Comm: syzkaller109734 Not tainted 4.16.0+ #11 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1a7/0x27d lib/dump_stack.c:53 print_unlock_imbalance_bug+0x12f/0x140 kernel/locking/lockdep.c:3484 __lock_release kernel/locking/lockdep.c:3691 [inline] lock_release+0x6fe/0xa40 kernel/locking/lockdep.c:3939 up_write+0x72/0x210 kernel/locking/rwsem.c:132 mrunlock_excl fs/xfs/mrlock.h:74 [inline] xfs_iunlock+0x36f/0x4a0 fs/xfs/xfs_inode.c:329 xfs_inode_item_unlock+0x82/0xa0 fs/xfs/xfs_inode_item.c:600 xfs_trans_free_items+0x176/0x230 fs/xfs/xfs_trans.c:790 xfs_trans_cancel+0x1bb/0x260 fs/xfs/xfs_trans.c:1047 xfs_qm_dqread+0xc7c/0x13b0 fs/xfs/xfs_dquot.c:623 xfs_qm_dqget+0x6b9/0x2060 fs/xfs/xfs_dquot.c:766 xfs_qm_quotacheck_dqadjust+0xe4/0x800 fs/xfs/xfs_qm.c:1080 xfs_qm_dqusage_adjust+0x814/0x11c0 fs/xfs/xfs_qm.c:1194 xfs_bulkstat_ag_ichunk fs/xfs/xfs_itable.c:302 [inline] xfs_bulkstat+0xc0a/0x1cb0 fs/xfs/xfs_itable.c:487 xfs_qm_quotacheck+0x3cb/0x800 fs/xfs/xfs_qm.c:1340 xfs_qm_mount_quotas+0x2c4/0x470 fs/xfs/xfs_qm.c:1459 xfs_mountfs+0x22a1/0x2690 fs/xfs/xfs_mount.c:982 xfs_fs_fill_super+0xc8d/0x1250 fs/xfs/xfs_super.c:1703 mount_bdev+0x2b7/0x370 fs/super.c:1119 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1770 mount_fs+0x66/0x2d0 fs/super.c:1222 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:2509 [inline] do_new_mount fs/namespace.c:2512 [inline] do_mount+0xea4/0x2bb0 fs/namespace.c:2842 SYSC_mount fs/namespace.c:3058 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3035 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x44488a RSP: 002b:00007fff118ea198 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda R
--- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@googlegroups.com.
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