| 问题：读写u盘内容时插拔u盘内核崩溃问题 内核报错日志： root@imx6qsabresd:~# dd if=/dev/urandom of=/dev/sda1 bs=1M count=1024 [ 361.110177] usb 1-1.2: USB disconnect, device number 39 [ 361.194087] FAT-fs (sda1): FAT read failed (blocknr 2582) [ 361.528671] Unable to handle kernel paging request at virtual address 2a9e5000 [ 361.535908] pgd = a96b4000 [ 361.538620] [2a9e5000] *pgd=00000000 [ 361.542219] Internal error: Oops: 5 [#1] PREEMPT SMP ARM [ 361.547535] Modules linked in: wlan mxc_dcic [ 361.551862] CPU: 2 PID: 1160 Comm: dd Not tainted 4.1.15-00016-ga44221e #1 [ 361.558741] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 361.565275] task: a8395000 ti: a97c4000 task.ti: a97c4000 [ 361.570694] PC is at __percpu_counter_add+0x30/0x104 [ 361.575665] LR is at __percpu_counter_add+0x28/0x104 [ 361.580638] pc : [<802fb890>] lr : [<802fb888>] psr: 200e0093 [ 361.580638] sp : a97c5d70 ip : 00000000 fp : 00000200 [ 361.592120] r10: abc30cc0 r9 : 00000200 r8 : 00000000 [ 361.597351] r7 : 00000000 r6 : 00000001 r5 : 00000018 r4 : a83df550 [ 361.603882] r3 : 00000000 r2 : 2a9e5000 r1 : 80adedec r0 : 00000002 [ 361.610416] Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user [ 361.617642] Control: 10c53c7d Table: 396b404a DAC: 00000015 [ 361.623395] Process dd (pid: 1160, stack limit = 0xa97c4210) [ 361.629058] Stack: (0xa97c5d70 to 0xa97c6000) [ 361.633423] 5d60: a83df530 80c3ba4c abc30cc0 a00e0013 [ 361.641610] 5d80: 00000000 00000200 abc30cc0 800c6764 00000018 8087bc98 abc30cc0 a6024d64 [ 361.649797] 5da0: a6024d74 8012eacc a6493e80 00000000 00001000 00000000 a6493e80 80130818 [ 361.657982] 5dc0: 00001000 00000000 00001000 00001000 a6024c90 00000000 a89f09c0 80889218 [ 361.666167] 5de0: 00001000 801308a4 abc30cc0 00001000 a6024d64 00001000 00000000 80133b1c [ 361.674353] 5e00: 00001000 00001000 abc30cc0 8011c018 00000000 80133af4 a97c5f14 800bd8e4 [ 361.682538] 5e20: 00001000 00001000 abc30cc0 8011c018 00400000 00000000 a8977e50 00000000 [ 361.690724] 5e40: a97c4000 00000000 abc30cc0 8011c018 5948f429 00000000 a97c5f28 a6024d64 [ 361.698909] 5e60: a89f09c0 00000000 00000000 a89f09c0 a97c5f14 800becc0 00000000 00000000 [ 361.707094] 5e80: 00000000 00000000 00000000 00000000 00000000 d7e00000 00000000 a97c5f28 [ 361.715279] 5ea0: a89f09c0 a97c5f14 00000000 00000000 0002d800 801346cc 00000006 8038ba84 [ 361.723465] 5ec0: a9fe3648 0000c000 a97c5ec8 a97c5ec8 a97c5ed0 a97c5ed0 a97c5ed8 a97c5ed8 [ 361.731651] 5ee0: 00100000 a89f09c0 00000000 00100000 a97c5f88 00400000 00000000 80103f00 [ 361.739837] 5f00: 00100000 76f73000 76f57d14 76bbd000 00100000 00000001 00000000 00100000 [ 361.748022] 5f20: a97c5f0c 00000001 a89f09c0 00000000 00400000 00000000 00000000 00000000 [ 361.756207] 5f40: 00000000 00000000 a8102a70 a89f09c0 00100000 76bbd000 a97c5f88 8000f604 [ 361.764393] 5f60: a97c4000 801046a8 00000000 a8992240 a89f09c0 a89f09c0 76bbd000 00100000 [ 361.772578] 5f80: 8000f604 80104ec0 00400000 00000000 00102008 00000000 00100000 0002d898 [ 361.780764] 5fa0: 00000004 8000f480 00000000 00100000 00000001 76bbd000 00100000 00000000 [ 361.788949] 5fc0: 00000000 00100000 0002d898 00000004 76bbd000 00000000 00000001 0002d800 [ 361.797135] 5fe0: 00000000 7ee94b2c 000146d8 76efb800 400e0010 00000001 00000000 00000000 [ 361.805334] [<802fb890>] (__percpu_counter_add) from [<800c6764>] (account_page_dirtied+0x74/0xe0) [ 361.814310] [<800c6764>] (account_page_dirtied) from [<8012eacc>] (__set_page_dirty+0x50/0xb8) [ 361.822936] [<8012eacc>] (__set_page_dirty) from [<80130818>] (__block_commit_write+0x84/0xac) [ 361.831560] [<80130818>] (__block_commit_write) from [<801308a4>] (block_write_end+0x40/0x80) [ 361.840100] [<801308a4>] (block_write_end) from [<80133b1c>] (blkdev_write_end+0x28/0x48) [ 361.848295] [<80133b1c>] (blkdev_write_end) from [<800bd8e4>] (generic_perform_write+0x114/0x1ac) [ 361.857182] [<800bd8e4>] (generic_perform_write) from [<800becc0>] (__generic_file_write_iter+0x178/0x1c8) [ 361.866849] [<800becc0>] (__generic_file_write_iter) from [<801346cc>] (blkdev_write_iter+0x98/0x138) [ 361.876084] [<801346cc>] (blkdev_write_iter) from [<80103f00>] (__vfs_write+0xa8/0xd8) [ 361.884013] [<80103f00>] (__vfs_write) from [<801046a8>] (vfs_write+0x90/0x16c) [ 361.891335] [<801046a8>] (vfs_write) from [<80104ec0>] (SyS_write+0x44/0x9c) [ 361.898401] [<80104ec0>] (SyS_write) from [<8000f480>] (ret_fast_syscall+0x0/0x3c) [ 361.905980] Code: e34800ad ebffd0bb e5943018 ee1d2f90 (e7933002) [ 361.912082] ---[ end trace 89058ac714e79a6b ]--- [ 361.916707] note: dd[1160] exited with preempt_count 2 解决方法见链接： 补丁如下： diff --git a/block/blk-core.c b/block/blk-core.c index bbbf36e6066b..edf8d72daa83 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -554,7 +554,7 @@ void blk_cleanup_queue(struct request_queue *q) q->queue_lock = &q->__queue_lock; spin_unlock_irq(lock); - bdi_destroy(&q->backing_dev_info); + bdi_unregister(&q->backing_dev_info); /* @q is and will stay empty, shutdown and put */ blk_put_queue(q); diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 2b8fd302f677..c0bb3291859c 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -501,6 +501,7 @@ static void blk_release_queue(struct kobject *kobj) struct request_queue *q = container_of(kobj, struct request_queue, kobj); + bdi_exit(&q->backing_dev_info); blkcg_exit_queue(q); if (q->elevator) { diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index d87d8eced064..17d1799f8552 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -110,12 +110,15 @@ struct backing_dev_info { struct backing_dev_info *inode_to_bdi(struct inode *inode); int __must_check bdi_init(struct backing_dev_info *bdi); -void bdi_destroy(struct backing_dev_info *bdi); +void bdi_exit(struct backing_dev_info *bdi); __printf(3, 4) int bdi_register(struct backing_dev_info *bdi, struct device *parent, const char *fmt, ...); int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev); +void bdi_unregister(struct backing_dev_info *bdi); +void bdi_destroy(struct backing_dev_info *bdi); + int __must_check bdi_setup_and_register(struct backing_dev_info *, char *); void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages, enum wb_reason reason); diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 000e7b3b9896..1cf18ff42c54 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -421,10 +421,8 @@ err: } EXPORT_SYMBOL(bdi_init); -void bdi_destroy(struct backing_dev_info *bdi) +void bdi_unregister(struct backing_dev_info *bdi) { - int i; - bdi_wb_shutdown(bdi); bdi_set_min_ratio(bdi, 0); @@ -436,11 +434,24 @@ void bdi_destroy(struct backing_dev_info *bdi) device_unregister(bdi->dev); bdi->dev = NULL; } +} + +void bdi_exit(struct backing_dev_info *bdi) +{ + int i; + + WARN_ON_ONCE(bdi->dev); for (i = 0; i < NR_BDI_STAT_ITEMS; i++) percpu_counter_destroy(&bdi->bdi_stat[i]); fprop_local_destroy_percpu(&bdi->completions); } + +void bdi_destroy(struct backing_dev_info *bdi) +{ + bdi_unregister(bdi); + bdi_exit(bdi); +} EXPORT_SYMBOL(bdi_destroy); /* |
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