=============================== [ INFO: suspicious RCU usage. ] 4.4.174+ #4 Not tainted ------------------------------- net/ipv6/ip6_fib.c:1465 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 7 locks held by blkid/32468: #0: (&mm->mmap_sem){++++++}, at: [] SYSC_mprotect mm/mprotect.c:428 [inline] #0: (&mm->mmap_sem){++++++}, at: [] SyS_mprotect+0x179/0x670 mm/mprotect.c:397 #1: (&mapping->i_mmap_rwsem){++++..}, at: [] i_mmap_lock_write include/linux/fs.h:522 [inline] #1: (&mapping->i_mmap_rwsem){++++..}, at: [] vma_adjust+0x121/0x1280 mm/mmap.c:821 #2: (&anon_vma->rwsem){++++..}, at: [] anon_vma_lock_write include/linux/rmap.h:113 [inline] #2: (&anon_vma->rwsem){++++..}, at: [] vma_adjust+0x1d1/0x1280 mm/mmap.c:841 #3: (((&net->ipv6.ip6_fib_timer))){+.-...}, at: [] lockdep_copy_map include/linux/lockdep.h:165 [inline] #3: (((&net->ipv6.ip6_fib_timer))){+.-...}, at: [] call_timer_fn+0xde/0x850 kernel/time/timer.c:1175 #4: (fib6_gc_lock){+.-...}, at: [] spin_lock_bh include/linux/spinlock.h:307 [inline] #4: (fib6_gc_lock){+.-...}, at: [] fib6_run_gc+0x3a/0x230 net/ipv6/ip6_fib.c:1811 #5: (rcu_read_lock){......}, at: [] __fib6_clean_all+0x0/0x240 net/ipv6/ip6_fib.c:1698 #6: (&tb->tb6_lock){++--..}, at: [] __fib6_clean_all+0xe8/0x240 net/ipv6/ip6_fib.c:1712 stack backtrace: CPU: 1 PID: 32468 Comm: blkid Not tainted 4.4.174+ #4 0000000000000000 02ffb59e8d7950b7 ffff8801db707940 ffffffff81aad1a1 ffff8800b67ae8c0 0000000000000000 0000000000000001 00000000000005b9 ffff8801a9bcc740 ffff8801db707970 ffffffff813ab7d6 ffff8801db707b90 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [] lockdep_rcu_suspicious.cold+0x10a/0x149 kernel/locking/lockdep.c:4305 [] fib6_del+0x7ea/0xae0 net/ipv6/ip6_fib.c:1465 [] fib6_clean_node+0x29c/0x500 net/ipv6/ip6_fib.c:1652 [] fib6_walk_continue+0x3e0/0x630 net/ipv6/ip6_fib.c:1578 [] fib6_walk+0x91/0xe0 net/ipv6/ip6_fib.c:1623 [] fib6_clean_tree+0xe8/0x120 net/ipv6/ip6_fib.c:1697 [] __fib6_clean_all+0x100/0x240 net/ipv6/ip6_fib.c:1713 [] fib6_clean_all net/ipv6/ip6_fib.c:1724 [inline] [] fib6_run_gc+0xaf/0x230 net/ipv6/ip6_fib.c:1821 [] fib6_gc_timer_cb+0x1d/0x30 net/ipv6/ip6_fib.c:1836 [] call_timer_fn+0x18d/0x850 kernel/time/timer.c:1185 [] __run_timers kernel/time/timer.c:1261 [inline] [] run_timer_softirq+0x51f/0xb70 kernel/time/timer.c:1444 [] __do_softirq+0x226/0xa3f kernel/softirq.c:273 [] invoke_softirq kernel/softirq.c:350 [inline] [] irq_exit+0x10a/0x150 kernel/softirq.c:391 [] exiting_irq arch/x86/include/asm/apic.h:652 [inline] [] smp_apic_timer_interrupt+0x7e/0xb0 arch/x86/kernel/apic/apic.c:926 [] apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:768 [] ? vma_interval_tree_augment_propagate mm/interval_tree.c:24 [inline] [] ? __rb_erase_augmented include/linux/rbtree_augmented.h:236 [inline] [] ? rb_erase_augmented include/linux/rbtree_augmented.h:244 [inline] [] ? vma_interval_tree_remove+0x4d3/0xdd0 mm/interval_tree.c:24 [] vma_adjust+0xadf/0x1280 mm/mmap.c:849 [] __split_vma.isra.0+0x4b5/0x5e0 mm/mmap.c:2584 [] split_vma+0x5b/0x80 mm/mmap.c:2613 [] mprotect_fixup+0x6f6/0x860 mm/mprotect.c:361 [] SYSC_mprotect mm/mprotect.c:476 [inline] [] SyS_mprotect+0x2f8/0x670 mm/mprotect.c:397 [] entry_SYSCALL_64_fastpath+0x1e/0x9a audit: type=1400 audit(1553293446.255:6567): avc: denied { create } for pid=32482 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 vmalloc: allocation failure: 0 bytes audit: type=1400 audit(1553293446.405:6568): avc: denied { write } for pid=32482 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 syz-executor.2: page allocation failure: order:0, mode:0x24000c2 CPU: 1 PID: 32499 Comm: syz-executor.2 Not tainted 4.4.174+ #4 0000000000000000 7dbac2f833c7c34b ffff8800973d79f0 ffffffff81aad1a1 1ffff10012e7af41 ffff8800b83517c0 00000000024000c2 0000000000000000 ffffffff82895080 ffff8800973d7b00 ffffffff8148c0cb ffffffff00000001 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [] warn_alloc_failed.cold+0x78/0x99 mm/page_alloc.c:2757 [] __vmalloc_node_range mm/vmalloc.c:1693 [inline] [] __vmalloc_node_range+0x365/0x650 mm/vmalloc.c:1654 [] __vmalloc_node mm/vmalloc.c:1716 [inline] [] __vmalloc_node_flags mm/vmalloc.c:1730 [inline] [] vmalloc+0x5c/0x70 mm/vmalloc.c:1745 [] sel_write_load+0x119/0xf90 security/selinux/selinuxfs.c:527 audit: type=1400 audit(1553293446.615:6569): avc: denied { read } for pid=32482 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1553293446.625:6570): avc: denied { create } for pid=32482 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1553293446.625:6571): avc: denied { write } for pid=32482 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1553293446.655:6572): avc: denied { read } for pid=32482 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 [] __vfs_write+0x116/0x3d0 fs/read_write.c:491 [] vfs_write+0x182/0x4e0 fs/read_write.c:540 [] SYSC_write fs/read_write.c:587 [inline] [] SyS_write+0xdc/0x1c0 fs/read_write.c:579 [] entry_SYSCALL_64_fastpath+0x1e/0x9a Mem-Info: active_anon:148222 inactive_anon:21038 isolated_anon:0 active_file:7344 inactive_file:15121 isolated_file:0 unevictable:0 dirty:138 writeback:0 unstable:0 slab_reclaimable:5399 slab_unreclaimable:72573 mapped:61812 shmem:30250 pagetables:26236 bounce:0 free:1272583 free_pcp:509 free_cma:0 DMA32 free:2322648kB min:4696kB low:5868kB high:7044kB active_anon:272420kB inactive_anon:40868kB active_file:13744kB inactive_file:27684kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3145324kB managed:3021976kB mlocked:0kB dirty:112kB writeback:0kB mapped:114516kB shmem:58440kB slab_reclaimable:10136kB slab_unreclaimable:131492kB kernel_stack:17280kB pagetables:49276kB unstable:0kB bounce:0kB free_pcp:880kB local_pcp:280kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 3504 3504 Normal free:2767840kB min:5580kB low:6972kB high:8368kB active_anon:320540kB inactive_anon:43272kB active_file:15632kB inactive_file:32800kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:4718592kB managed:3588764kB mlocked:0kB dirty:448kB writeback:0kB mapped:132840kB shmem:62560kB slab_reclaimable:11460kB slab_unreclaimable:158704kB kernel_stack:21248kB pagetables:55684kB unstable:0kB bounce:0kB free_pcp:1348kB local_pcp:664kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 DMA32: 242*4kB (UME) 352*8kB (UME) 645*16kB (UME) 149*32kB (UME) 95*64kB (UME) 40*128kB (UME) 20*256kB (UME) 14*512kB (UME) 7*1024kB (UME) 4*2048kB (ME) 553*4096kB (M) = 2322808kB Normal: 43*4kB (UME) 141*8kB (UME) 750*16kB (UME) 264*32kB audit: type=1400 audit(1553293447.135:6573): avc: denied { create } for pid=32529 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 (UME) 104*64kB (UME) 72*128kB (UME) 32*256kB (UME) 11*512kB (ME) 6*1024kB (ME) 2*2048kB (M) 660*4096kB (UM) = 2765044kB 52720 total pagecache pages 0 pages in swap cache audit: type=1400 audit(1553293447.245:6574): avc: denied { write } for pid=32529 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 Swap cache stats: add 0, delete 0, find 0/0 Free swap = 0kB Total swap = 0kB 1965979 pages RAM 0 pages HighMem/MovableOnly 313294 pages reserved audit: type=1400 audit(1553293447.375:6575): avc: denied { read } for pid=32529 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 vmalloc: allocation failure: 0 bytes syz-executor.2: page allocation failure: order:0, mode:0x24000c2 CPU: 0 PID: 32557 Comm: syz-executor.2 Not tainted 4.4.174+ #4 0000000000000000 5932736dbfd59edc ffff8800969ef9f0 ffffffff81aad1a1 1ffff10012d3df41 ffff8801ab9a5f00 00000000024000c2 0000000000000000 ffffffff82895080 ffff8800969efb00 ffffffff8148c0cb ffffffff00000001 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [] warn_alloc_failed.cold+0x78/0x99 mm/page_alloc.c:2757 [] __vmalloc_node_range mm/vmalloc.c:1693 [inline] [] __vmalloc_node_range+0x365/0x650 mm/vmalloc.c:1654 [] __vmalloc_node mm/vmalloc.c:1716 [inline] [] __vmalloc_node_flags mm/vmalloc.c:1730 [inline] [] vmalloc+0x5c/0x70 mm/vmalloc.c:1745 [] sel_write_load+0x119/0xf90 security/selinux/selinuxfs.c:527 [] __vfs_write+0x116/0x3d0 fs/read_write.c:491 [] vfs_write+0x182/0x4e0 fs/read_write.c:540 [] SYSC_write fs/read_write.c:587 [inline] [] SyS_write+0xdc/0x1c0 fs/read_write.c:579 [] entry_SYSCALL_64_fastpath+0x1e/0x9a Mem-Info: active_anon:148378 inactive_anon:21033 isolated_anon:0 active_file:7350 inactive_file:15121 isolated_file:0 unevictable:0 dirty:144 writeback:0 unstable:0 slab_reclaimable:5399 slab_unreclaimable:72681 mapped:61839 shmem:30250 pagetables:26399 bounce:0 free:1272039 free_pcp:666 free_cma:0 audit: type=1400 audit(1553293447.895:6576): avc: denied { create } for pid=32574 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 DMA32 free:2322028kB min:4696kB low:5868kB high:7044kB active_anon:272740kB inactive_anon:40868kB active_file:13756kB inactive_file:27684kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3145324kB managed:3021976kB mlocked:0kB dirty:124kB writeback:0kB mapped:114516kB shmem:58440kB slab_reclaimable:10136kB slab_unreclaimable:131408kB kernel_stack:16992kB pagetables:49572kB unstable:0kB bounce:0kB free_pcp:980kB local_pcp:344kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 3504 3504 Normal free:2766932kB min:5580kB low:6972kB high:8368kB active_anon:320836kB inactive_anon:43264kB active_file:15656kB inactive_file:32804kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:4718592kB managed:3588764kB mlocked:0kB dirty:468kB writeback:0kB mapped:132840kB shmem:62560kB slab_reclaimable:11460kB slab_unreclaimable:159212kB kernel_stack:21344kB pagetables:55792kB unstable:0kB bounce:0kB free_pcp:1156kB local_pcp:712kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 DMA32: 262*4kB (UME) 347*8kB (UME) 632*16kB (UME) 152*32kB (UME) 83*64kB (UME) 41*128kB (UME) 20*256kB (UME) 14*512kB (UME) 7*1024kB (UME) 4*2048kB (ME) 553*4096kB (M) = 2322096kB Normal: 349*4kB (UM) 334*8kB (UME) 743*16kB (UME) 247*32kB (UME) 100*64kB (UME) 72*128kB (UME) 31*256kB (UME) 12*512kB (ME) 6*1024kB (ME) 2*2048kB (M) 660*4096kB (UM) = 2767156kB 52724 total pagecache pages 0 pages in swap cache Swap cache stats: add 0, delete 0, find 0/0 Free swap = 0kB Total swap = 0kB 1965979 pages RAM 0 pages HighMem/MovableOnly 313294 pages reserved vmalloc: allocation failure: 0 bytes syz-executor.2: page allocation failure: order:0, mode:0x24000c2 CPU: 0 PID: 32607 Comm: syz-executor.2 Not tainted 4.4.174+ #4 0000000000000000 385c5461ac880aa0 ffff8801bd10f9f0 ffffffff81aad1a1 1ffff10037a21f41 ffff8801cfee2f80 00000000024000c2 0000000000000000 ffffffff82895080 ffff8801bd10fb00 ffffffff8148c0cb ffffffff00000001 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [] warn_alloc_failed.cold+0x78/0x99 mm/page_alloc.c:2757 [] __vmalloc_node_range mm/vmalloc.c:1693 [inline] [] __vmalloc_node_range+0x365/0x650 mm/vmalloc.c:1654 [] __vmalloc_node mm/vmalloc.c:1716 [inline] [] __vmalloc_node_flags mm/vmalloc.c:1730 [inline] [] vmalloc+0x5c/0x70 mm/vmalloc.c:1745 [] sel_write_load+0x119/0xf90 security/selinux/selinuxfs.c:527 [] __vfs_write+0x116/0x3d0 fs/read_write.c:491 [] vfs_write+0x182/0x4e0 fs/read_write.c:540 [] SYSC_write fs/read_write.c:587 [inline] [] SyS_write+0xdc/0x1c0 fs/read_write.c:579 [] entry_SYSCALL_64_fastpath+0x1e/0x9a Mem-Info: active_anon:148377 inactive_anon:21036 isolated_anon:0 active_file:7356 inactive_file:15122 isolated_file:0 unevictable:0 dirty:151 writeback:0 unstable:0 slab_reclaimable:5399 slab_unreclaimable:72369 mapped:61839 shmem:30250 pagetables:26474 bounce:0 free:1273444 free_pcp:497 free_cma:0 DMA32 free:2323672kB min:4696kB low:5868kB high:7044kB active_anon:272740kB inactive_anon:40868kB active_file:13760kB inactive_file:27684kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3145324kB managed:3021976kB mlocked:0kB dirty:128kB writeback:0kB mapped:114516kB shmem:58440kB slab_reclaimable:10136kB slab_unreclaimable:130788kB kernel_stack:16928kB pagetables:49816kB unstable:0kB bounce:0kB free_pcp:1224kB local_pcp:600kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 3504 3504 Normal free:2770140kB min:5580kB low:6972kB high:8368kB active_anon:320768kB inactive_anon:43276kB active_file:15664kB inactive_file:32804kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:4718592kB managed:3588764kB mlocked:0kB dirty:476kB writeback:0kB mapped:132840kB shmem:62560kB slab_reclaimable:11460kB slab_unreclaimable:158460kB kernel_stack:21216kB pagetables:55932kB unstable:0kB bounce:0kB free_pcp:1236kB local_pcp:608kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 DMA32: 256*4kB (ME) 339*8kB (UME) 640*16kB (UME) 152*32kB (UME) 87*64kB (UME) 40*128kB (UME) 21*256kB (UME) 11*512kB (UME) 6*1024kB (ME) 4*2048kB (ME) 554*4096kB (UM) = 2324056kB Normal: 369*4kB (UME) 395*8kB (UME) 746*16kB (UME) 256*32kB (UME) 89*64kB (UME) 69*128kB (UME) 32*256kB (UME) 12*512kB (UME) 5*1024kB (ME) 4*2048kB (UM) 660*4096kB (UM) = 2770300kB 52727 total pagecache pages 0 pages in swap cache Swap cache stats: add 0, delete 0, find 0/0 Free swap = 0kB Total swap = 0kB 1965979 pages RAM 0 pages HighMem/MovableOnly 313294 pages reserved audit_printk_skb: 33 callbacks suppressed audit: type=1400 audit(1553293451.445:6588): avc: denied { create } for pid=32706 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1553293451.495:6589): avc: denied { write } for pid=32706 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1553293451.535:6590): avc: denied { read } for pid=32706 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1553293451.975:6591): avc: denied { create } for pid=32719 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1553293452.085:6592): avc: denied { write } for pid=32719 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1553293452.285:6593): avc: denied { read } for pid=32719 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1