unevictable:0 dirty:17 writeback:0 unstable:0 slab_reclaimable:4078 slab_unreclaimable:12462 mapped:66318 shmem:124 pagetables:1018 bounce:0 free:31446 free_pcp:500 free_cma:0 Node 0 active_anon:136936kB inactive_anon:360kB active_file:1624kB inactive_file:1684kB unevictable:0kB isolated(anon):0kB isolated(file):24kB mapped:265272kB dirty:68kB writeback:0kB shmem:496kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 118784kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no BUG: unable to handle kernel NULL pointer dereference at 00000000000008d4 Node 0 PGD 800000021bb5d067 P4D 800000021bb5d067 PUD 1bf922067 PMD 0 Oops: 0002 [#1] SMP PTI Dumping ftrace buffer: DMA free:15904kB min:144kB low:180kB high:216kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15904kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB (ftrace buffer empty) Modules linked in: CPU: 1 PID: 27074 Comm: syz-executor1 Not tainted 4.17.0+ #22 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 lowmem_reserve[]: RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65 RSP: 0018:ffff88001464f5e8 EFLAGS: 00010046 0 RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: 0000000000000fb0 RDX: 0000000000000fb0 RSI: 0000000000000000 RDI: 00000000000008d4 RBP: ffff88001464f5f8 R08: 0000000180400040 R09: 00000000000008d4 R10: 0000000000000000 R11: 0000000180400040 R12: ffff88004b542620 2816 R13: 0000000000000000 R14: 0000000000000282 R15: fffffffffffffff4 FS: 00007f118aeda700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000008d4 CR3: 00000000153d0000 CR4: 00000000001406e0 7242 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 7242 kmsan_thread_create+0x4b/0x90 mm/kmsan/kmsan_hooks.c:30 __kthread_create_on_node+0x6ba/0x7b0 kernel/kthread.c:333 kthread_create_on_node+0x243/0x270 kernel/kthread.c:369 loop_prepare_queue drivers/block/loop.c:869 [inline] loop_set_fd drivers/block/loop.c:930 [inline] lo_ioctl+0x3163/0x4450 drivers/block/loop.c:1398 Node 0 DMA32 free:57800kB min:26228kB low:32784kB high:39340kB active_anon:58464kB inactive_anon:68kB active_file:136kB inactive_file:0kB unevictable:0kB writepending:12kB present:3129292kB managed:2889512kB mlocked:0kB kernel_stack:1408kB pagetables:268kB bounce:0kB free_pcp:652kB local_pcp:488kB free_cma:0kB __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x2290/0x4f80 block/ioctl.c:601 lowmem_reserve[]: 0 0 block_ioctl+0x16f/0x1d0 fs/block_dev.c:1877 4426 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0xcbd/0x24b0 fs/ioctl.c:686 4426 ksys_ioctl fs/ioctl.c:701 [inline] __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x280/0x320 fs/ioctl.c:706 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ba9 Node 0 RSP: 002b:00007f118aed9c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f118aeda6d4 RCX: 0000000000455ba9 RDX: 0000000000000014 RSI: 0000000000004c00 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 Normal free:52080kB min:41208kB low:51508kB high:61808kB active_anon:78068kB inactive_anon:296kB active_file:1944kB inactive_file:1756kB unevictable:0kB writepending:172kB present:4718592kB managed:4532224kB mlocked:0kB kernel_stack:9088kB pagetables:3804kB bounce:0kB free_pcp:1288kB local_pcp:608kB free_cma:0kB R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004be0a6 R14: 00000000004cc700 R15: 0000000000000000 Code: lowmem_reserve[]: 48 c1 e9 03 40 0f b6 f6 0 48 b8 01 01 01 01 01 01 0 01 01 48 0f af c6 f3 48 ab 0 89 d1 f3 aa 4c 89 c8 c3 90 0 49 89 f9 40 88 f0 48 89 d1 aa 4c 89 c8 c3 90 49 89 Node 0 fa 40 0f b6 ce 48 b8 01 DMA: 01 01 01 01 RIP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65 RSP: ffff88001464f5e8 CR2: 00000000000008d4 0*4kB ---[ end trace 330aa7dcd37a1ab2 ]---