INFO: task syz-executor1:10100 blocked for more than 140 seconds.
Not tainted 4.19.0-rc7+ #59
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1 D23512 10100 5427 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
blk_mq_freeze_queue_wait+0x1d4/0x460 block/blk-mq.c:152
blk_freeze_queue+0x4a/0x80 block/blk-mq.c:181
blk_mq_freeze_queue+0x15/0x20 block/blk-mq.c:190
loop_set_status+0x1ff/0x1010 drivers/block/loop.c:1131
loop_set_status64+0xaa/0x100 drivers/block/loop.c:1317
lo_ioctl+0x90e/0x1d80 drivers/block/loop.c:1433
__blkdev_driver_ioctl block/ioctl.c:303 [inline]
blkdev_ioctl+0x9ac/0x2010 block/ioctl.c:601
block_ioctl+0xee/0x130 fs/block_dev.c:1883
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
__do_sys_ioctl fs/ioctl.c:709 [inline]
__se_sys_ioctl fs/ioctl.c:707 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: Bad RIP value.
RSP: 002b:00007f32bd5ecc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000020000240 RSI: 0000000000004c04 RDI: 0000000000000005
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f32bd5ed6d4
R13: 00000000004c0481 R14: 00000000004d0630 R15: 00000000ffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/982:
#0: 00000000b1a0815b (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435
1 lock held by rsyslogd/5290:
#0: 000000000d0c8c52 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
2 locks held by getty/5380:
#0: 0000000097d2baee (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000dc942666 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5381:
#0: 00000000ea491176 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000f2691457 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5382:
#0: 00000000768d5e39 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000e6fed0fb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5383:
#0: 00000000ce214a26 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000bba28ceb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5384:
#0: 0000000044fb9597 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000a554aec6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5385:
#0: 0000000022d8353b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000d3b2516a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5386:
#0: 00000000b4967e23 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000002a23878d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
3 locks held by kworker/u4:5/9747:
1 lock held by syz-executor1/10100:
#0: 000000009b7e2008 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8e/0x1d80 drivers/block/loop.c:1403
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc7+ #59
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
watchdog+0xb3e/0x1050 kernel/hung_task.c:265
kthread+0x35a/0x420 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 1 to CPUs 0:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.386 msecs
NMI backtrace for cpu 0
CPU: 0 PID: 9747 Comm: kworker/u4:5 Not tainted 4.19.0-rc7+ #59
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:69 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x26/0x50 kernel/kcov.c:101
Code: 5d c3 66 90 55 48 89 e5 65 48 8b 04 25 40 ee 01 00 65 8b 15 6c 44 83 7e 81 e2 00 01 1f 00 48 8b 75 08 75 2b 8b 90 d0 12 00 00 <83> fa 02 75 20 48 8b 88 d8 12 00 00 8b 80 d4 12 00 00 48 8b 11 48
RSP: 0018:ffff880181725b48 EFLAGS: 00000246
RAX: ffff880183bbe380 RBX: ffffea0006d4ab00 RCX: ffffffff81a4ed66
RDX: 0000000000000000 RSI: ffffffff81a4ed75 RDI: 0000000000000007
RBP: ffff880181725b48 R08: ffff880183bbe380 R09: ffffed003b5c4732
R10: ffffed003b5c4732 R11: ffff8801dae23993 R12: ffff880181726050
R13: ffffea0006d4ab08 R14: 1ffff100302e4b6e R15: 02fffc000001106d
FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f158751f800 CR3: 00000001d7579000 CR4: 00000000001406f0
Call Trace:
compound_head include/linux/page-flags.h:142 [inline]
PageReferenced include/linux/page-flags.h:275 [inline]
mark_page_accessed+0xdd5/0x2040 mm/swap.c:396
pagecache_get_page+0x7cd/0xf00 mm/filemap.c:1567
find_or_create_page include/linux/pagemap.h:322 [inline]
grow_dev_page fs/buffer.c:947 [inline]
grow_buffers fs/buffer.c:1016 [inline]
__getblk_slow fs/buffer.c:1043 [inline]
__getblk_gfp+0x3b0/0xd50 fs/buffer.c:1320
__bread_gfp+0x2d/0x300 fs/buffer.c:1354
sb_bread include/linux/buffer_head.h:307 [inline]
__fat_write_inode+0x347/0xb60 fs/fat/inode.c:859
fat_write_inode+0x97/0x180 fs/fat/inode.c:908
write_inode fs/fs-writeback.c:1183 [inline]
__writeback_single_inode+0xf1f/0x1620 fs/fs-writeback.c:1382
writeback_sb_inodes+0x71f/0x11d0 fs/fs-writeback.c:1587
__writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1656
wb_writeback+0xa73/0xfc0 fs/fs-writeback.c:1765
wb_check_old_data_flush fs/fs-writeback.c:1867 [inline]
wb_do_writeback fs/fs-writeback.c:1920 [inline]
wb_workfn+0x1008/0x1790 fs/fs-writeback.c:1949
process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153
worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
kthread+0x35a/0x420 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413