INFO: task kcompactd0:1657 blocked for more than 143 seconds. Not tainted 5.13.0-next-20210706-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:27568 pid: 1657 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5957 schedule+0xd3/0x270 kernel/sched/core.c:6036 io_schedule+0xba/0x130 kernel/sched/core.c:8025 wait_on_page_bit_common+0x537/0xe60 mm/filemap.c:1346 lock_page include/linux/pagemap.h:676 [inline] __unmap_and_move mm/migrate.c:1034 [inline] unmap_and_move mm/migrate.c:1184 [inline] migrate_pages+0xa5d/0x3970 mm/migrate.c:1459 compact_zone+0x1ab9/0x3860 mm/compaction.c:2399 kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2814 kcompactd+0x262/0xd10 mm/compaction.c:2909 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task syz-executor.2:17126 can't die for more than 144 seconds. task:syz-executor.2 state:R running task stack:24888 pid:17126 ppid: 8495 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4700 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5957 Showing all locks held in the system: 1 lock held by systemd/1: 5 locks held by kworker/u4:0/8: 1 lock held by khungtaskd/1633: #0: ffffffff8b97ea40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by kswapd0/2152: 1 lock held by kswapd1/2153: 1 lock held by systemd-journal/4850: 2 locks held by systemd-udevd/4876: 2 locks held by in:imklog/8164: 2 locks held by agetty/8387: #0: ffff8880279d1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc90000f0d2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 2 locks held by syz-fuzzer/8473: 1 lock held by syz-executor.2/17126: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1633 Comm: khungtaskd Not tainted 5.13.0-next-20210706-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:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 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:254 [inline] watchdog+0xd3e/0xf50 kernel/hung_task.c:339 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8164 Comm: in:imklog Not tainted 5.13.0-next-20210706-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:hlock_class kernel/locking/lockdep.c:194 [inline] RIP: 0010:mark_lock+0xa3/0x17b0 kernel/locking/lockdep.c:4571 Code: 10 01 00 00 31 c0 41 83 fc 09 0f 87 3f 01 00 00 41 83 fc 08 49 89 f5 0f 84 f6 00 00 00 bd 01 00 00 00 44 89 e1 d3 e5 48 63 ed <4d> 8d 7d 20 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 0f RSP: 0018:ffffc9000b946ab0 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 1ffff92001728d5d RCX: ffffffff815ab9dd RDX: 0000000000000002 RSI: ffff88801579dff0 RDI: ffff88801579e012 RBP: 0000000000000200 R08: 0000000000000000 R09: ffffffff8fcd28c7 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000009 R13: ffff88801579dff0 R14: ffff88801579df78 R15: dffffc0000000000 FS: 00007f21cc4f3700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000b7631c CR3: 0000000017e97000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_usage kernel/locking/lockdep.c:4514 [inline] __lock_acquire+0x8a7/0x54a0 kernel/locking/lockdep.c:4969 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:687 [inline] page_evictable+0x38/0x360 mm/internal.h:82 move_pages_to_lru+0x2b3/0x2160 mm/vmscan.c:2046 shrink_inactive_list mm/vmscan.c:2165 [inline] shrink_list mm/vmscan.c:2389 [inline] shrink_lruvec+0xbbf/0x2230 mm/vmscan.c:2684 shrink_node_memcgs mm/vmscan.c:2872 [inline] shrink_node+0x868/0x1df0 mm/vmscan.c:2989 shrink_zones mm/vmscan.c:3192 [inline] do_try_to_free_pages+0x388/0x14b0 mm/vmscan.c:3247 try_to_free_pages+0x29f/0x750 mm/vmscan.c:3486 __perform_reclaim mm/page_alloc.c:4616 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4637 [inline] __alloc_pages_slowpath.constprop.0+0x828/0x21b0 mm/page_alloc.c:5041 __alloc_pages+0x412/0x500 mm/page_alloc.c:5398 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 alloc_slab_page mm/slub.c:1713 [inline] allocate_slab+0x349/0x4c0 mm/slub.c:1861 new_slab mm/slub.c:1916 [inline] new_slab_objects mm/slub.c:2662 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2825 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2865 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2989 [inline] kmem_cache_alloc_trace+0x30f/0x3c0 mm/slub.c:3006 kmalloc include/linux/slab.h:591 [inline] syslog_print+0xb2/0x430 kernel/printk/printk.c:1494 do_syslog.part.0+0x367/0x830 kernel/printk/printk.c:1664 do_syslog+0x49/0x60 kernel/printk/printk.c:1644 kmsg_read+0x90/0xb0 fs/proc/kmsg.c:40 pde_read fs/proc/inode.c:311 [inline] proc_reg_read+0x119/0x300 fs/proc/inode.c:321 vfs_read+0x1b5/0x570 fs/read_write.c:494 ksys_read+0x12d/0x250 fs/read_write.c:634 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: 0033:0x7f21ceb3622d Code: c1 20 00 00 75 10 b8 00 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 b8 00 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 97 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f21cc4d2580 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f21ceb3622d RDX: 0000000000001fa0 RSI: 00007f21cc4d2da0 RDI: 0000000000000004 RBP: 0000559747ba09d0 R08: 0000000000000000 R09: 0000000004000001 R10: 0000000000000001 R11: 0000000000000293 R12: 00007f21cc4d2da0 R13: 0000000000001fa0 R14: 0000000000001f9f R15: 00007f21cc4d2e30