BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 1 PID: 21706 Comm: syz-executor.3 Not tainted 4.14.229-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 add_chain_cache kernel/locking/lockdep.c:2303 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:2415 [inline] validate_chain kernel/locking/lockdep.c:2435 [inline] __lock_acquire.cold+0x19a/0x97c kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get+0xbd/0x2c0 kernel/time/timekeeping.c:760 hrtimer_expires_remaining include/linux/hrtimer.h:261 [inline] __hrtimer_get_remaining+0xd7/0x1d0 kernel/time/hrtimer.c:1060 hrtimer_get_remaining include/linux/hrtimer.h:404 [inline] perf_swevent_cancel_hrtimer kernel/events/core.c:8788 [inline] perf_swevent_cancel_hrtimer kernel/events/core.c:8783 [inline] cpu_clock_event_stop kernel/events/core.c:8842 [inline] cpu_clock_event_del+0x78/0xc0 kernel/events/core.c:8857 event_sched_out+0x8b3/0x11b0 kernel/events/core.c:1867 group_sched_out+0x13e/0x3c0 kernel/events/core.c:1897 ctx_sched_out+0x4f4/0x9d0 kernel/events/core.c:2852 task_ctx_sched_out+0x5b/0x80 kernel/events/core.c:2320 perf_event_context_sched_out kernel/events/core.c:3035 [inline] __perf_event_task_sched_out+0x853/0x11d0 kernel/events/core.c:3126 perf_event_task_sched_out include/linux/perf_event.h:1104 [inline] prepare_task_switch kernel/sched/core.c:2601 [inline] context_switch kernel/sched/core.c:2773 [inline] __schedule+0xc74/0x1de0 kernel/sched/core.c:3384 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:3508 ___preempt_schedule+0x16/0x18 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xaf/0xe0 kernel/locking/spinlock.c:192 spin_unlock_irqrestore include/linux/spinlock.h:372 [inline] pcpu_alloc+0x578/0xf50 mm/percpu.c:1447 ppp_dev_configure+0x511/0xeb0 drivers/net/ppp/ppp_generic.c:1046 ppp_create_interface drivers/net/ppp/ppp_generic.c:3029 [inline] ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:864 [inline] ppp_ioctl+0x136c/0x21e0 drivers/net/ppp/ppp_generic.c:600 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007f4f8fef3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000020000680 RSI: 00000000c004743e RDI: 0000000000000003 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe4fa5b59f R14: 00007f4f8fef3300 R15: 0000000000022000 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 22423 Comm: syz-executor.3 Not tainted 4.14.229-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x149 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc+0x40/0x3c0 mm/slab.c:3550 mempool_alloc+0x10e/0x2d0 mm/mempool.c:330 bio_alloc_bioset+0x41b/0x830 block/bio.c:486 bio_alloc include/linux/bio.h:422 [inline] submit_bh_wbc+0xf5/0x6f0 fs/buffer.c:3121 __block_write_full_page+0x4ee/0x9f0 fs/buffer.c:1838 block_write_full_page+0x1d0/0x240 fs/buffer.c:3008 writeout mm/migrate.c:855 [inline] fallback_migrate_page mm/migrate.c:879 [inline] move_to_new_page+0x403/0x8d0 mm/migrate.c:930 __unmap_and_move mm/migrate.c:1096 [inline] unmap_and_move mm/migrate.c:1182 [inline] migrate_pages+0x1120/0x2420 mm/migrate.c:1427 compact_zone+0x12cb/0x2550 mm/compaction.c:1601 compact_node+0xf2/0x180 mm/compaction.c:1819 compact_nodes mm/compaction.c:1835 [inline] sysctl_compaction_handler+0x53/0x90 mm/compaction.c:1849 proc_sys_call_handler.isra.0+0x1ba/0x340 fs/proc/proc_sysctl.c:598 __vfs_write+0xe4/0x630 fs/read_write.c:480 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007f4f8fef3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f4f8fef31d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe4fa5b59f R14: 00007f4f8fef3300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 22458 Comm: syz-executor.1 Not tainted 4.14.229-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x149 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc+0x40/0x3c0 mm/slab.c:3550 mempool_alloc+0x10e/0x2d0 mm/mempool.c:330 bio_alloc_bioset+0x41b/0x830 block/bio.c:486 bio_alloc include/linux/bio.h:422 [inline] submit_bh_wbc+0xf5/0x6f0 fs/buffer.c:3121 __block_write_full_page+0x4ee/0x9f0 fs/buffer.c:1838 block_write_full_page+0x1d0/0x240 fs/buffer.c:3008 writeout mm/migrate.c:855 [inline] fallback_migrate_page mm/migrate.c:879 [inline] move_to_new_page+0x403/0x8d0 mm/migrate.c:930 __unmap_and_move mm/migrate.c:1096 [inline] unmap_and_move mm/migrate.c:1182 [inline] migrate_pages+0x1120/0x2420 mm/migrate.c:1427 compact_zone+0x12cb/0x2550 mm/compaction.c:1601 compact_node+0xf2/0x180 mm/compaction.c:1819 compact_nodes mm/compaction.c:1835 [inline] sysctl_compaction_handler+0x53/0x90 mm/compaction.c:1849 proc_sys_call_handler.isra.0+0x1ba/0x340 fs/proc/proc_sysctl.c:598 __vfs_write+0xe4/0x630 fs/read_write.c:480 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007fdc49bcd188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fdc49bcd1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd6d683b2f R14: 00007fdc49bcd300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 22466 Comm: syz-executor.3 Not tainted 4.14.229-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x149 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc_node mm/slab.c:3297 [inline] kmem_cache_alloc_node+0x54/0x410 mm/slab.c:3640 create_task_io_context+0x2a/0x3c0 block/blk-ioc.c:278 create_io_context block/blk.h:323 [inline] generic_make_request_checks+0x1350/0x19f0 block/blk-core.c:2127 generic_make_request+0x67/0x850 block/blk-core.c:2185 submit_bio+0x234/0x390 block/blk-core.c:2303 submit_bh_wbc+0x526/0x6f0 fs/buffer.c:3147 __block_write_full_page+0x4ee/0x9f0 fs/buffer.c:1838 block_write_full_page+0x1d0/0x240 fs/buffer.c:3008 writeout mm/migrate.c:855 [inline] fallback_migrate_page mm/migrate.c:879 [inline] move_to_new_page+0x403/0x8d0 mm/migrate.c:930 __unmap_and_move mm/migrate.c:1096 [inline] unmap_and_move mm/migrate.c:1182 [inline] migrate_pages+0x1120/0x2420 mm/migrate.c:1427 compact_zone+0x12cb/0x2550 mm/compaction.c:1601 compact_node+0xf2/0x180 mm/compaction.c:1819 compact_nodes mm/compaction.c:1835 [inline] sysctl_compaction_handler+0x53/0x90 mm/compaction.c:1849 proc_sys_call_handler.isra.0+0x1ba/0x340 fs/proc/proc_sysctl.c:598 __vfs_write+0xe4/0x630 fs/read_write.c:480 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007f4f8fef3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f4f8fef31d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe4fa5b59f R14: 00007f4f8fef3300 R15: 0000000000022000 IPVS: ftp: loaded support on port[0] = 21