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Date: Sat, 7 Nov 2015 13:07:30 +0100 From: Richard Weinberger <richard@....at> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Cc: linux-fsdevel <linux-fsdevel@...r.kernel.org>, Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.cz>, octavian.purdila@...el.com, Al Viro <viro@...iv.linux.org.uk> Subject: WARNING: CPU: 0 PID: 1 at fs/block_dev.c:58 __blkdev_put+0x16f/0x1b0() Hi! While playing with the Linux kernel library I run into this warning. Root cause of the warning is that the backing file on the host side is locked an therefore all IO on it results into -EIO. The question is whether ext4/jbd2 should abort earlier or not. The WARN_ON_ONCE in bdev_write_inode() triggers as jbd2's do_one_pass() sets up a dirty buffer_head and fails later. Then ext4 gives up, calls blkdev_put() and we reach bdev_write_inode() with a dirty ->bd_inode. What do you think? [ 0.128000] blk_update_request: I/O error, dev vda, sector 0 [ 0.128000] Buffer I/O error on dev vda, logical block 0, lost async page write [ 0.128000] blk_update_request: I/O error, dev vda, sector 8 [ 0.128000] Buffer I/O error on dev vda, logical block 1, lost async page write [ 0.128000] blk_update_request: I/O error, dev vda, sector 528 [ 0.128000] Buffer I/O error on dev vda, logical block 66, lost async page write [ 0.128000] blk_update_request: I/O error, dev vda, sector 1824 [ 0.128000] Buffer I/O error on dev vda, logical block 228, lost async page write [ 0.128000] blk_update_request: I/O error, dev vda, sector 1864 [ 0.128000] Buffer I/O error on dev vda, logical block 233, lost async page write [ 0.128000] blk_update_request: I/O error, dev vda, sector 41840 [ 0.128000] Buffer I/O error on dev vda, logical block 5230, lost async page write [ 0.128000] blk_update_request: I/O error, dev vda, sector 262672 [ 0.128000] Buffer I/O error on dev vda, logical block 32834, lost async page write [ 0.128000] blk_update_request: I/O error, dev vda, sector 262680 [ 0.128000] Buffer I/O error on dev vda, logical block 32835, lost async page write [ 0.128000] blk_update_request: I/O error, dev vda, sector 262752 [ 0.128000] Buffer I/O error on dev vda, logical block 32844, lost async page write [ 0.128000] blk_update_request: I/O error, dev vda, sector 262792 [ 0.128000] Buffer I/O error on dev vda, logical block 32849, lost async page write [ 0.132000] JBD2: recovery failed [ 0.132000] EXT4-fs (vda): error loading journal [ 0.132000] ------------[ cut here ]------------ [ 0.132000] WARNING: CPU: 0 PID: 1 at fs/block_dev.c:58 __blkdev_put+0x16f/0x1b0() [ 0.132000] Call Trace: [ 0.132000] 00007fd99262db68: [<0040673d>] warn_slowpath_common+0x7d/0xb0 [ 0.132000] 00007fd99262dba8: [<004068d5>] warn_slowpath_null+0x15/0x20 [ 0.132000] 00007fd99262dbb8: [<0048efbf>] __blkdev_put+0x16f/0x1b0 [ 0.132000] 00007fd99262dbf8: [<0048fcd2>] blkdev_put+0x92/0x110 [ 0.132000] 00007fd99262dc28: [<00462faf>] kill_block_super+0x3f/0x70 [ 0.132000] 00007fd99262dc48: [<00461bf2>] deactivate_locked_super+0x52/0xb0 [ 0.132000] 00007fd99262dc78: [<00462f51>] mount_bdev+0x1b1/0x1d0 [ 0.132000] 00007fd99262dc80: [<004c5c40>] ext4_fill_super+0x0/0x32f0 [ 0.132000] 00007fd99262dce8: [<004c16f0>] ext4_mount+0x10/0x20 [ 0.132000] 00007fd99262dcf8: [<00463164>] mount_fs+0x14/0xc0 [ 0.132000] 00007fd99262dd28: [<0047a38e>] vfs_kern_mount+0x5e/0x120 [ 0.132000] 00007fd99262dd78: [<0047baa8>] do_mount+0x208/0xd90 [ 0.132000] 00007fd99262dd88: [<0045d7db>] __kmalloc_track_caller+0x18b/0x1c0 [ 0.132000] 00007fd99262dd98: [<00450618>] strndup_user+0x48/0x60 [ 0.132000] 00007fd99262de08: [<00450618>] strndup_user+0x48/0x60 [ 0.132000] 00007fd99262de48: [<0047c99a>] SyS_mount+0x6a/0xb0 [ 0.132000] 00007fd99262de98: [<00403b89>] run_syscalls+0xd9/0x1c0 [ 0.132000] 00007fd99262deb0: [<00425970>] autoremove_wake_function+0x0/0x40 [ 0.132000] 00007fd99262dec8: [<005535f0>] kernel_init+0x0/0xf0 [ 0.132000] 00007fd99262dee8: [<005535f0>] kernel_init+0x0/0xf0 [ 0.132000] 00007fd99262df08: [<00402f2d>] run_init_process+0x1d/0x40 [ 0.132000] 00007fd99262df18: [<00553626>] kernel_init+0x36/0xf0 [ 0.132000] 00007fd99262df28: [<00403158>] thread_bootstrap+0x48/0x50 [ 0.132000] [ 0.132000] ---[ end trace 0b886a9a044a4995 ]--- Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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