syzbot


INFO: task hung in fat_count_free_clusters

Status: auto-closed as invalid on 2019/02/22 15:19
First crash: 2104d, last: 2096d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in fat_count_free_clusters exfat 6 1918d 2097d 0/26 closed as dup on 2018/10/27 13:33

Sample crash report:
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
INFO: task syz-executor0:17253 blocked for more than 140 seconds.
b_state=0x00000029, b_size=512
      Not tainted 4.9.113-g47bbcd6 #10
device loop0 blocksize: 4096
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
30024 17253   7824 0x00000004
device loop0 blocksize: 4096
 ffff88019ce39800 ffff8801d57bea00
__find_get_block_slow() failed. block=1, b_blocknr=8
 ffff8801bf7a3480b_state=0x00000029, b_size=512
 ffff8801d914c800device loop0 blocksize: 4096
 ffff8801db221c18 ffff8801d74a7978
__find_get_block_slow() failed. block=1, b_blocknr=8
 ffffffff839e909db_state=0x00000029, b_size=512
 ffff88019ce3a0c8device loop0 blocksize: 4096
 ffffed00339c7418 ffff88019ce39800
__find_get_block_slow() failed. block=1, b_blocknr=8
 00fffc0000000000b_state=0x00000029, b_size=512
 ffff8801db2224e8device loop0 blocksize: 4096
Call Trace:
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 [<ffffffff839ea69f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
device loop0 blocksize: 4096
 [<ffffffff839eb023>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
__find_get_block_slow() failed. block=1, b_blocknr=8
 [<ffffffff839ef4a6>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839ef4a6>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 [<ffffffff818c7922>] lock_fat fs/fat/fatent.c:278 [inline]
 [<ffffffff818c7922>] fat_count_free_clusters+0x122/0xa50 fs/fat/fatent.c:657
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 [<ffffffff818ce0e4>] fat_statfs+0x394/0x4a0 fs/fat/inode.c:807
device loop0 blocksize: 4096
 [<ffffffff8161de03>] statfs_by_dentry+0x133/0x200 fs/statfs.c:60
__find_get_block_slow() failed. block=1, b_blocknr=8
 [<ffffffff8161df13>] vfs_statfs+0x43/0x220 fs/statfs.c:70
b_state=0x00000029, b_size=512
 [<ffffffff8161e19b>] user_statfs+0xab/0x120 fs/statfs.c:85
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 [<ffffffff8161e28f>] SYSC_statfs+0x7f/0xf0 fs/statfs.c:175
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 [<ffffffff8161e6ad>] SyS_statfs+0x1d/0x30 fs/statfs.c:172
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
b_state=0x00000029, b_size=512
 [<ffffffff839f9f93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
device loop0 blocksize: 4096

Showing all locks held in the system:
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by khungtaskd/519:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
 (rcu_read_lock){......}__find_get_block_slow() failed. block=1, b_blocknr=8
, at: [<ffffffff8136675c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
, at: [<ffffffff8136675c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1: 
device loop0 blocksize: 4096
 (tasklist_lock){.+.?..}__find_get_block_slow() failed. block=1, b_blocknr=8
, at: [<ffffffff81425de7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
device loop0 blocksize: 4096
1 lock held by rsyslogd/3677:
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 
b_state=0x00000029, b_size=512
 (device loop0 blocksize: 4096
&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d81ec>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3773:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
 (&tty->ldisc_sem){++++++}__find_get_block_slow() failed. block=1, b_blocknr=8
, at: [<ffffffff839f8142>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1: 
device loop0 blocksize: 4096
 (&ldata->atomic_read_lock){+.+...}__find_get_block_slow() failed. block=1, b_blocknr=8
, at: [<ffffffff8211ee22>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
3 locks held by kworker/u4:6/5098:
device loop0 blocksize: 4096
 #0:  ("%s""netns"
__find_get_block_slow() failed. block=1, b_blocknr=8
){.+.+.+}b_state=0x00000029, b_size=512
, at: [<ffffffff8118d08e>] work_static include/linux/workqueue.h:186 [inline]
, at: [<ffffffff8118d08e>] set_work_data kernel/workqueue.c:617 [inline]
, at: [<ffffffff8118d08e>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
, at: [<ffffffff8118d08e>] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085
__find_get_block_slow() failed. block=1, b_blocknr=8
 #1: 
b_state=0x00000029, b_size=512
 (device loop0 blocksize: 4096
net_cleanup_work){+.+.+.}, at: [<ffffffff8118d0c8>] process_one_work+0x728/0x1500 kernel/workqueue.c:2089
 #2: 
b_state=0x00000029, b_size=512
 (device loop0 blocksize: 4096
net_mutex){+.+.+.}, at: [<ffffffff8305ca3f>] cleanup_net+0x13f/0x630 net/core/net_namespace.c:439
b_state=0x00000029, b_size=512
1 lock held by syz-executor0/17253:
device loop0 blocksize: 4096
 #0:  (&sbi->fat_lock
__find_get_block_slow() failed. block=1, b_blocknr=8
){+.+...}b_state=0x00000029, b_size=512
, at: [<ffffffff818c7922>] lock_fat fs/fat/fatent.c:278 [inline]
, at: [<ffffffff818c7922>] fat_count_free_clusters+0x122/0xa50 fs/fat/fatent.c:657
1 lock held by syz-executor5/17271:
 #0: 
__find_get_block_slow() failed. block=1, b_blocknr=8
 (b_state=0x00000029, b_size=512
&net->xfrm.xfrm_cfg_mutexdevice loop0 blocksize: 4096
){+.+.+.}, at: [<ffffffff835217c0>] xfrm_netlink_rcv+0x60/0x90 net/xfrm/xfrm_user.c:2538
1 lock held by syz-executor5/17277:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
 (&net->xfrm.xfrm_cfg_mutex){+.+.+.}__find_get_block_slow() failed. block=1, b_blocknr=8
, at: [<ffffffff835217c0>] xfrm_netlink_rcv+0x60/0x90 net/xfrm/xfrm_user.c:2538
1 lock held by syz-executor5/17278:
device loop0 blocksize: 4096
 #0:  (&net->xfrm.xfrm_cfg_mutex
__find_get_block_slow() failed. block=1, b_blocknr=8
){+.+.+.}b_state=0x00000029, b_size=512
, at: [<ffffffff835217c0>] xfrm_netlink_rcv+0x60/0x90 net/xfrm/xfrm_user.c:2538
1 lock held by init/17320:
 #0: 
__find_get_block_slow() failed. block=1, b_blocknr=8
 (b_state=0x00000029, b_size=512
tty_mutexdevice loop0 blocksize: 4096
){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
1 lock held by init/17321:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
1 lock held by init/17322:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
1 lock held by init/17323:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
1 lock held by init/17324:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
1 lock held by init/17325:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125

b_state=0x00000029, b_size=512
=============================================

device loop0 blocksize: 4096
NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.113-g47bbcd6 #10
__find_get_block_slow() failed. block=1, b_blocknr=8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
b_state=0x00000029, b_size=512
 ffff8801d8637d08
device loop0 blocksize: 4096
 ffffffff81eb32a9 0000000000000000 0000000000000000__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 0000000000000000
device loop0 blocksize: 4096
 0000000000000001 ffffffff810b9bd0 ffff8801d8637d40__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 ffffffff81ebe5a7
device loop0 blocksize: 4096
 0000000000000000 0000000000000000 0000000000000003__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
Call Trace:
device loop0 blocksize: 4096
 [<ffffffff81eb32a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb32a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 [<ffffffff81ebe5a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 [<ffffffff81ebe53a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
b_state=0x00000029, b_size=512
 [<ffffffff810b9cd4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
device loop0 blocksize: 4096
 [<ffffffff81366cf4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366cf4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366cf4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366cf4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 [<ffffffff839fa15c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
b_state=0x00000029, b_size=512
Sending NMI from CPU 0 to CPUs 1:
device loop0 blocksize: 4096
NMI backtrace for cpu 1
CPU: 1 PID: 22 Comm: kworker/u4:1 Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfnc (flush-7:0)c
task: ffff8801d9ae9800 task.stack: ffff8801d9bf0000
RIP: 0010:[<ffffffff8125f9a0>] c [<ffffffff8125f9a0>] vprintk_default+0x0/0x30 kernel/printk/printk.c:1914
RSP: 0018:ffff8801d9bf7478  EFLAGS: 00000293
RAX: ffffffff8125f9a0 RBX: ffffed003b37ee90 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801d9bf74a0 RDI: ffffffff83cce880
RBP: ffff8801d9bf7520 R08: ffff8801d9aea160 R09: 0000000000000001
R10: ffff8801d9ae9800 R11: 1ffff1003b35d427 R12: ffffffff83cce880
R13: ffffea00065366c0 R14: ffff8801afac41f8 R15: ffff8801d9c16350
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd0b4ff9a30 CR3: 00000001c090e000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff8142cbbcc 0000000041b58ab3c ffffffff843bb788c ffffffff8142cb0dc
 0000000000000000c ffffffff00000008c ffff8801d9bf7530c ffff8801d9bf74e0c
 0000000000000000c ffff8801d9c16548c 0000000000000000c 000000018143a141c
Call Trace:
 [<ffffffff81cb96ba>] __find_get_block_slow.cold.57+0x37/0xf0 fs/buffer.c:238
 [<ffffffff8162458e>] __find_get_block+0x23e/0x4c0 fs/buffer.c:1360
 [<ffffffff81625399>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff81625399>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff81628d3d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818cc63b>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818cc63b>] __fat_write_inode+0x2ab/0x980 fs/fat/inode.c:844
 [<ffffffff818d0849>] fat_write_inode+0x79/0x170 fs/fat/inode.c:893
 [<ffffffff8160238d>] write_inode fs/fs-writeback.c:1180 [inline]
 [<ffffffff8160238d>] __writeback_single_inode+0x86d/0x1020 fs/fs-writeback.c:1379
 [<ffffffff8160368c>] writeback_sb_inodes+0x4ac/0xe70 fs/fs-writeback.c:1584
 [<ffffffff8160414b>] __writeback_inodes_wb+0xfb/0x1e0 fs/fs-writeback.c:1653
 [<ffffffff816048d2>] wb_writeback+0x512/0xbd0 fs/fs-writeback.c:1762
 [<ffffffff8160e200>] wb_check_old_data_flush fs/fs-writeback.c:1877 [inline]
 [<ffffffff8160e200>] wb_do_writeback fs/fs-writeback.c:1901 [inline]
 [<ffffffff8160e200>] wb_workfn+0x850/0xdb0 fs/fs-writeback.c:1930
 [<ffffffff8118d181>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118df76>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa15c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: c54 c49 c89 cf4 c53 c48 c89 cfb ce8 cee cf0 c0f c00 c4d c89 ce1 c49 c89 cd8 c31 cc9 c31 cd2 cbe cff cff cff cff c31 cff ce8 c48 cf8 cff cff c5b c41 c5c c5d cc3 c0f c1f c00 c<55> c48 c89 ce5 c41 c54 c49 c89 cf4 c53 c48 c89 cfb ce8 cbe cf0 c0f c00 c4c c89 ce6 c
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/22 17:19 https://android.googlesource.com/kernel/common android-4.9 47bbcd6bf8f9 8cc079c3 .config console log report ci-android-49-kasan-gce-root
2018/07/14 15:19 https://android.googlesource.com/kernel/common android-4.9 9e7903954483 92a49505 .config console log report ci-android-49-kasan-gce-root
* Struck through repros no longer work on HEAD.