INFO: task kcompactd0:30 blocked for more than 143 seconds.
Not tainted 5.16.0-rc2-next-20211125-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kcompactd0 state:D stack:27616 pid: 30 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4983 [inline]
__schedule+0xab2/0x4d90 kernel/sched/core.c:6293
schedule+0xd2/0x260 kernel/sched/core.c:6366
io_schedule+0xee/0x170 kernel/sched/core.c:8411
folio_wait_bit_common+0x4f2/0xa90 mm/filemap.c:1372
lock_page include/linux/pagemap.h:796 [inline]
__unmap_and_move mm/migrate.c:970 [inline]
unmap_and_move mm/migrate.c:1253 [inline]
migrate_pages+0x8f1/0x52e0 mm/migrate.c:1536
compact_zone+0x1ada/0x3880 mm/compaction.c:2400
kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2840
kcompactd+0x86b/0xf30 mm/compaction.c:2942
kthread+0x405/0x4f0 kernel/kthread.c:345
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task syz-executor.1:22740 can't die for more than 144 seconds.
task:syz-executor.1 state:R running task stack:24424 pid:22740 ppid: 13079 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4983 [inline]
__schedule+0xab2/0x4d90 kernel/sched/core.c:6293
preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6459
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
_raw_spin_unlock_irq+0x3c/0x40 kernel/locking/spinlock.c:202
spin_unlock_irq include/linux/spinlock.h:404 [inline]
shrink_inactive_list mm/vmscan.c:2405 [inline]
shrink_list mm/vmscan.c:2621 [inline]
shrink_lruvec+0xdd7/0x2660 mm/vmscan.c:2940
shrink_node_memcgs mm/vmscan.c:3129 [inline]
shrink_node+0x858/0x1eb0 mm/vmscan.c:3252
shrink_zones mm/vmscan.c:3485 [inline]
do_try_to_free_pages+0x491/0x1620 mm/vmscan.c:3541
try_to_free_pages+0x29f/0x750 mm/vmscan.c:3776
__perform_reclaim mm/page_alloc.c:4603 [inline]
__alloc_pages_direct_reclaim mm/page_alloc.c:4624 [inline]
__alloc_pages_slowpath.constprop.0+0xa9e/0x2080 mm/page_alloc.c:5014
__alloc_pages+0x412/0x500 mm/page_alloc.c:5389
alloc_pages+0x1a7/0x300 mm/mempolicy.c:2192
folio_alloc+0x1c/0x70 mm/mempolicy.c:2202
filemap_alloc_folio+0x8e/0xb0 mm/filemap.c:1037
__page_cache_alloc include/linux/pagemap.h:374 [inline]
page_cache_ra_unbounded+0x365/0x780 mm/readahead.c:215
do_page_cache_ra+0xf9/0x140 mm/readahead.c:268
do_sync_mmap_readahead mm/filemap.c:3084 [inline]
filemap_fault+0x157f/0x21c0 mm/filemap.c:3177
__do_fault+0x10d/0x790 mm/memory.c:3845
do_read_fault mm/memory.c:4160 [inline]
do_fault mm/memory.c:4289 [inline]
handle_pte_fault mm/memory.c:4547 [inline]
__handle_mm_fault+0x2771/0x4170 mm/memory.c:4682
handle_mm_fault+0x1c8/0x790 mm/memory.c:4780
faultin_page mm/gup.c:939 [inline]
__get_user_pages+0x522/0xfb0 mm/gup.c:1160
populate_vma_page_range+0x24d/0x330 mm/gup.c:1492
__mm_populate+0x1ea/0x3e0 mm/gup.c:1601
mm_populate include/linux/mm.h:2734 [inline]
vm_mmap_pgoff+0x20e/0x290 mm/util.c:524
ksys_mmap_pgoff+0x40d/0x5a0 mm/mmap.c:1629
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f1f051f2ae9
RSP: 002b:00007f1f04168188 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f1f05305f60 RCX: 00007f1f051f2ae9
RDX: 0000000001000002 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f1f0524cff7 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd1cb0c2ff R14: 00007f1f04168300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb83220 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by kswapd0/91:
1 lock held by in:imklog/6236:
#0: ffff88807cc2b770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
2 locks held by agetty/6482:
#0: ffff888018a9b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252
#1: ffffc9000207c2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113
1 lock held by syz-fuzzer/6526:
5 locks held by kworker/u4:2/22620:
1 lock held by syz-executor.1/22740:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc2-next-20211125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:256 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:413
kthread+0x405/0x4f0 kernel/kthread.c:345
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6237 Comm: rs:main Q:Reg Not tainted 5.16.0-rc2-next-20211125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x60 kernel/kcov.c:200
Code: be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 19 8b 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 00 01 ff 00 74 0e 85 c9 74 35 8b 82 ac 15 00 00 85 c0 74 2b 8b
RSP: 0018:ffffc9000af2ed28 EFLAGS: 00000046
RAX: 0000000080000001 RBX: ffffea0002b64048 RCX: 0000000000000000
RDX: ffff88807e359d40 RSI: ffffffff81a561ae RDI: 0000000000000003
RBP: ffffea0002b64040 R08: 0000000000000003 R09: 0000000000000000
R10: ffffffff81a561a0 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000003 R14: dffffc0000000000 R15: ffff888010c7d020
FS: 00007f3784ce7700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f377c023000 CR3: 000000006facd000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000b8fecd19 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
isolate_lru_pages+0x39e/0x1b00 mm/vmscan.c:2116
shrink_inactive_list mm/vmscan.c:2379 [inline]
shrink_list mm/vmscan.c:2621 [inline]
shrink_lruvec+0xb2e/0x2660 mm/vmscan.c:2940
shrink_node_memcgs mm/vmscan.c:3129 [inline]
shrink_node+0x858/0x1eb0 mm/vmscan.c:3252
shrink_zones mm/vmscan.c:3485 [inline]
do_try_to_free_pages+0x491/0x1620 mm/vmscan.c:3541
try_to_free_pages+0x29f/0x750 mm/vmscan.c:3776
__perform_reclaim mm/page_alloc.c:4603 [inline]
__alloc_pages_direct_reclaim mm/page_alloc.c:4624 [inline]
__alloc_pages_slowpath.constprop.0+0xa9e/0x2080 mm/page_alloc.c:5014
__alloc_pages+0x412/0x500 mm/page_alloc.c:5389
alloc_pages+0x1a7/0x300 mm/mempolicy.c:2192
folio_alloc+0x1c/0x70 mm/mempolicy.c:2202
filemap_alloc_folio mm/filemap.c:1037 [inline]
__filemap_get_folio+0x5f4/0xe50 mm/filemap.c:2039
pagecache_get_page+0x2e/0x280 mm/folio-compat.c:125
ext4_da_write_begin+0x3bb/0xba0 fs/ext4/inode.c:2958
generic_perform_write+0x205/0x510 mm/filemap.c:3842
ext4_buffered_write_iter+0x1ac/0x3b0 fs/ext4/file.c:269
ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:681
call_write_iter include/linux/fs.h:2162 [inline]
new_sync_write+0x429/0x660 fs/read_write.c:503
vfs_write+0x7cd/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f378772b1cd
Code: c2 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 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f3784ce6590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f377c022de0 RCX: 00007f378772b1cd
RDX: 0000000000000551 RSI: 00007f377c022de0 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f377c022b60
R13: 00007f3784ce65b0 R14: 0000564b9f7e3360 R15: 0000000000000551
----------------
Code disassembly (best guess):
0: be b0 01 00 00 mov $0x1b0,%esi
5: e8 b4 ff ff ff callq 0xffffffbe
a: 31 c0 xor %eax,%eax
c: c3 retq
d: 90 nop
e: 65 8b 05 19 8b 8a 7e mov %gs:0x7e8a8b19(%rip),%eax # 0x7e8a8b2e
15: 89 c1 mov %eax,%ecx
17: 48 8b 34 24 mov (%rsp),%rsi
1b: 81 e1 00 01 00 00 and $0x100,%ecx
21: 65 48 8b 14 25 40 70 mov %gs:0x27040,%rdx
28: 02 00
* 2a: a9 00 01 ff 00 test $0xff0100,%eax <-- trapping instruction
2f: 74 0e je 0x3f
31: 85 c9 test %ecx,%ecx
33: 74 35 je 0x6a
35: 8b 82 ac 15 00 00 mov 0x15ac(%rdx),%eax
3b: 85 c0 test %eax,%eax
3d: 74 2b je 0x6a
3f: 8b .byte 0x8b