INFO: task syz-executor0:21424 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc6+ #259
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D18888 21424  20582 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
 wb_wait_for_completion+0x1f9/0x2d0 fs/fs-writeback.c:221
 __writeback_inodes_sb_nr+0x405/0x580 fs/fs-writeback.c:2340
 try_to_writeback_inodes_sb+0x4e/0x70 fs/fs-writeback.c:2388
 ext4_nonda_switch+0x1b4/0x1f0 fs/ext4/inode.c:2979
 ext4_da_write_begin+0x212/0x12c0 fs/ext4/inode.c:3020
 generic_perform_write+0x3aa/0x6a0 mm/filemap.c:3139
 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3264
 ext4_file_write_iter+0x390/0x1420 fs/ext4/file.c:266
 call_write_iter include/linux/fs.h:1808 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x6b8/0x9f0 fs/read_write.c:487
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: 83 c4 18 c3 e8 d8 64 00 00 48 8b 04 24 48 8b 4c 24 08 48 89 01 e8 d7 2d fc ff e8 22 7a fc ff b8 02 00 00 00 48 8d 0d 6a 60 09 <01> 87 01 8b 05 62 60 09 01 83 f8 01 0f 85 8a 00 00 00 b8 01 00 00
RSP: 002b:00007f15d0db6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 00000000fffffe8c RSI: 0000000020000300 RDI: 0000000000000004
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f15d0db76d4
R13: 00000000004c5560 R14: 00000000004d8e98 R15: 00000000ffffffff
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 983 Comm: khungtaskd Not tainted 4.19.0-rc6+ #259
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 0 to CPUs 1:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.091 msecs
NMI backtrace for cpu 1
CPU: 1 PID: 5565 Comm: rs:main Q:Reg Not tainted 4.19.0-rc6+ #259
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:146
Code: 14 dd 28 00 00 00 4d 39 d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 <55> 48 89 e5 65 48 8b 04 25 40 ee 01 00 65 8b 15 2c 18 83 7e 81 e2
RSP: 0018:ffff8801be21eaa8 EFLAGS: 00000093
RAX: ffffffff81c28ce3 RBX: 1ffff10037c43d59 RCX: ffffffff8184e1ca
RDX: 0000000000000000 RSI: ffffffff8184e226 RDI: 0000000000000005
RBP: ffff8801be21eb50 R08: ffff8801be12e000 R09: ffffed003b0e2a20
R10: ffffed003b0e2a20 R11: ffff8801d8715103 R12: 0000000000000000
R13: ffff8801d4dc0800 R14: ffffffff81c288d8 R15: ffffffff8931f280
FS:  00007f5d23b4a700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000001d8721000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 qlink_free mm/kasan/quarantine.c:150 [inline]
 qlist_free_all+0xe8/0x140 mm/kasan/quarantine.c:166
 quarantine_reduce+0x163/0x1a0 mm/kasan/quarantine.c:259
 kasan_kmalloc+0x9b/0xe0 mm/kasan/kasan.c:538
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 slab_post_alloc_hook mm/slab.h:444 [inline]
 slab_alloc mm/slab.c:3392 [inline]
 kmem_cache_alloc+0x11b/0x730 mm/slab.c:3552
 kmem_cache_zalloc include/linux/slab.h:697 [inline]
 jbd2_alloc_handle include/linux/jbd2.h:1421 [inline]
 new_handle fs/jbd2/transaction.c:398 [inline]
 jbd2__journal_start+0x1e7/0xa90 fs/jbd2/transaction.c:423
 __ext4_journal_start_sb+0x1a5/0x5f0 fs/ext4/ext4_jbd2.c:81
 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline]
 ext4_truncate+0x4cc/0x1650 fs/ext4/inode.c:4477
 ext4_truncate_failed_write fs/ext4/truncate.h:20 [inline]
 ext4_write_begin+0xe34/0x1830 fs/ext4/inode.c:1341
 ext4_da_write_begin+0x713/0x12c0 fs/ext4/inode.c:3023
 generic_perform_write+0x3aa/0x6a0 mm/filemap.c:3139
 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3264
 ext4_file_write_iter+0x390/0x1420 fs/ext4/file.c:266
 call_write_iter include/linux/fs.h:1808 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x6b8/0x9f0 fs/read_write.c:487
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f5d255a819d
Code: d1 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 be fa ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 07 fb ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f5d23b48dd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000000000c8 RCX: 00007f5d255a819d
RDX: 00000000000000c8 RSI: 0000000001c83a90 RDI: 0000000000000005
RBP: 0000000001c83a90 R08: 656c6c616b7a7973 R09: 6c656e72656b2072
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f5d23b49250 R14: 0000000000000002 R15: 0000000001c83890