INFO: task kcompactd0:30 blocked for more than 143 seconds. Not tainted 5.15.0-rc4-next-20211006-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kcompactd0 state:D stack:28464 pid: 30 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6236 schedule+0xd3/0x270 kernel/sched/core.c:6315 io_schedule+0xba/0x130 kernel/sched/core.c:8359 folio_wait_bit_common+0x4f2/0xa60 mm/filemap.c:1364 lock_page include/linux/pagemap.h:747 [inline] __unmap_and_move mm/migrate.c:980 [inline] unmap_and_move mm/migrate.c:1204 [inline] migrate_pages+0xa5e/0x3890 mm/migrate.c:1481 compact_zone+0x1abb/0x3860 mm/compaction.c:2393 kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2833 kcompactd+0x86d/0xf30 mm/compaction.c:2935 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task syz-executor.2:16048 can't die for more than 144 seconds. task:syz-executor.2 state:R running task stack:25976 pid:16048 ppid: 9240 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6236 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6408 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b981260 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 2 locks held by kswapd0/98: 1 lock held by kswapd1/99: 1 lock held by systemd-journal/2956: 1 lock held by systemd-udevd/2969: 1 lock held by systemd-timesyn/3055: 1 lock held by cron/6238: 1 lock held by in:imklog/6245: 1 lock held by syz-fuzzer/6551: 1 lock held by syz-fuzzer/6552: 2 locks held by syz-fuzzer/12755: 3 locks held by kworker/0:12/12324: 2 locks held by syz-executor.2/16048: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc4-next-20211006-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:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 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+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x405/0x4f0 kernel/kthread.c:327 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: 6245 Comm: in:imklog Not tainted 5.15.0-rc4-next-20211006-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:stack_trace_consume_entry+0x87/0x160 kernel/stacktrace.c:89 Code: 81 00 00 00 48 8d 7b 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 <84> d2 0f 85 90 00 00 00 8b 43 0c 85 c0 75 53 48 b8 00 00 00 00 00 RSP: 0000:ffffc90000007720 EFLAGS: 00000202 RAX: 0000000000000007 RBX: ffffc90000007808 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff888da3ba RDI: ffffc90000007814 RBP: 0000000000000005 R08: ffffffff8e5e07e6 R09: 0000000000000001 R10: fffff52000000ef5 R11: 0000000000086089 R12: ffffc90000007808 R13: 0000000000000000 R14: ffff888078af3a00 R15: 0000000000000000 FS: 00007f28ba562700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560a21b6ee8d CR3: 00000000187a7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x6d/0xe0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3213 [inline] kmem_cache_alloc_node+0x25c/0x3d0 mm/slub.c:3249 __alloc_skb+0x214/0x360 net/core/skbuff.c:412 __netdev_alloc_skb+0x73/0x400 net/core/skbuff.c:492 netdev_alloc_skb include/linux/skbuff.h:2877 [inline] dev_alloc_skb include/linux/skbuff.h:2890 [inline] __ieee80211_beacon_get+0xdfa/0x1b20 net/mac80211/tx.c:5082 ieee80211_beacon_get_tim+0x88/0x930 net/mac80211/tx.c:5196 ieee80211_beacon_get include/net/mac80211.h:4992 [inline] mac80211_hwsim_beacon_tx+0x111/0x930 drivers/net/wireless/mac80211_hwsim.c:1808 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xcd/0x1c0 drivers/net/wireless/mac80211_hwsim.c:1861 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202 Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 2e c8 24 f8 48 89 ef e8 76 3e 25 f8 e8 e1 c2 45 f8 fb bf 01 00 00 00 36 d8 18 f8 65 8b 05 df 84 cb 76 85 c0 74 02 5d c3 0f 1f 44 00 RSP: 0000:ffffc9000bdff098 EFLAGS: 00000202 RAX: 0000000000035b29 RBX: 0000000000000021 RCX: 1ffffffff1fab136 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff888140728050 R08: 0000000000000001 R09: ffffffff8fd1e9df R10: 0000000000000001 R11: 0000000000000000 R12: ffffc9000bdff1c0 R13: 0000000000000000 R14: ffffc9000bdff260 R15: 0000000000000020 spin_unlock_irq include/linux/spinlock.h:418 [inline] shrink_inactive_list mm/vmscan.c:2298 [inline] shrink_list mm/vmscan.c:2530 [inline] shrink_lruvec+0xb70/0x25b0 mm/vmscan.c:2849 shrink_node_memcgs mm/vmscan.c:3038 [inline] shrink_node+0x858/0x1eb0 mm/vmscan.c:3161 shrink_zones mm/vmscan.c:3364 [inline] do_try_to_free_pages+0x386/0x1480 mm/vmscan.c:3419 try_to_free_pages+0x29f/0x750 mm/vmscan.c:3654 __perform_reclaim mm/page_alloc.c:4586 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4607 [inline] __alloc_pages_slowpath.constprop.0+0xac7/0x2290 mm/page_alloc.c:5024 __alloc_pages+0x412/0x500 mm/page_alloc.c:5395 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 folio_alloc+0x1c/0x70 mm/mempolicy.c:2201 filemap_alloc_folio+0x8e/0xb0 mm/filemap.c:1029 __page_cache_alloc include/linux/pagemap.h:325 [inline] page_cache_ra_unbounded+0x36a/0x940 mm/readahead.c:215 do_page_cache_ra+0xf9/0x140 mm/readahead.c:268 do_sync_mmap_readahead mm/filemap.c:2986 [inline] filemap_fault+0x1562/0x26d0 mm/filemap.c:3079 __do_fault+0x10d/0x4d0 mm/memory.c:3849 do_read_fault mm/memory.c:4155 [inline] do_fault mm/memory.c:4284 [inline] handle_pte_fault mm/memory.c:4542 [inline] __handle_mm_fault+0x28e8/0x5120 mm/memory.c:4677 handle_mm_fault+0x1c8/0x790 mm/memory.c:4775 do_user_addr_fault+0x48b/0x11c0 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1485 [inline] exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1541 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0033:0x7f28bcba4ed0 Code: Unable to access opcode bytes at RIP 0x7f28bcba4ea6. RSP: 002b:00007f28ba541578 EFLAGS: 00010293 RAX: 000000000000033e RBX: 0000000000000000 RCX: 00007f28bcba522d RDX: 000000000000033e RSI: 00007f28ba541da0 RDI: 0000000000000000 RBP: 0000561ab7e6a9d0 R08: 0000000000000000 R09: 0000000000000000 R10: 2ce33e6c02ce33e7 R11: 0000000000000293 R12: 00007f28ba541da0 R13: 0000000000001fa0 R14: 0000000000001f9f R15: 00007f28ba541e30 ---------------- Code disassembly (best guess): 0: 81 00 00 00 48 8d addl $0x8d480000,(%rax) 6: 7b 0c jnp 0x14 8: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax f: fc ff df 12: 48 89 fa mov %rdi,%rdx 15: 48 c1 ea 03 shr $0x3,%rdx 19: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx 1d: 48 89 f8 mov %rdi,%rax 20: 83 e0 07 and $0x7,%eax 23: 83 c0 03 add $0x3,%eax 26: 38 d0 cmp %dl,%al 28: 7c 08 jl 0x32 * 2a: 84 d2 test %dl,%dl <-- trapping instruction 2c: 0f 85 90 00 00 00 jne 0xc2 32: 8b 43 0c mov 0xc(%rbx),%eax 35: 85 c0 test %eax,%eax 37: 75 53 jne 0x8c 39: 48 rex.W 3a: b8 00 00 00 00 mov $0x0,%eax