Hello, I've got the following BUG while running syzkaller fuzzer. Note the injected kmalloc failure, most likely it's the root cause. FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 2 PID: 12823 Comm: syz-executor1 Not tainted 4.11.0-rc3+ #364 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x1b8/0x28d lib/dump_stack.c:52 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x78a/0x870 lib/fault-inject.c:154 should_failslab+0xec/0x120 mm/failslab.c:31 slab_pre_alloc_hook mm/slab.h:434 [inline] slab_alloc mm/slab.c:3394 [inline] kmem_cache_alloc_trace+0x206/0x720 mm/slab.c:3636 kmalloc include/linux/slab.h:490 [inline] region_chg+0x429/0xa80 mm/hugetlb.c:402 hugetlb_reserve_pages+0x16d/0x540 mm/hugetlb.c:4334 hugetlb_file_setup+0x40c/0x9f0 fs/hugetlbfs/inode.c:1289 newseg+0x422/0xd30 ipc/shm.c:575 ipcget_new ipc/util.c:285 [inline] ipcget+0x21e/0x580 ipc/util.c:639 SYSC_shmget ipc/shm.c:673 [inline] SyS_shmget+0x158/0x230 ipc/shm.c:657 entry_SYSCALL_64_fastpath+0x1f/0xc2 RIP: 0033:0x445b79 RSP: 002b:00007f273aba1858 EFLAGS: 00000282 ORIG_RAX: 000000000000001d RAX: ffffffffffffffda RBX: 0000000000708000 RCX: 0000000000445b79 RDX: 0000000000000900 RSI: 0000000000003000 RDI: 0000000000000000 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000282 R12: 00000000004a7e31 R13: 0000000000000000 R14: 00007f273aba1618 R15: 00007f273aba1788 ------------[ cut here ]------------ kernel BUG at mm/hugetlb.c:742! invalid opcode: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 2 PID: 12823 Comm: syz-executor1 Not tainted 4.11.0-rc3+ #364 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88006be3c0c0 task.stack: ffff88003daa0000 RIP: 0010:resv_map_release+0x265/0x330 mm/hugetlb.c:742 RSP: 0018:ffff88003daa7830 EFLAGS: 00010246 RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffc90002253000 RDX: 0000000000010000 RSI: ffffffff81976485 RDI: ffff88006b5bf950 RBP: ffff88003daa78e0 R08: 1ffff1000d7c7a5b R09: 0000000000000000 R10: 0000000000000006 R11: 0000000000000000 R12: ffff88006b5bf958 R13: ffffed0007b54f0f R14: ffff88006b5bf958 R15: ffff88006b5bf958 FS: 00007f273aba2700(0000) GS:ffff88006e200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f68fabe8000 CR3: 0000000014a09000 CR4: 00000000000026e0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: hugetlbfs_evict_inode+0x7b/0xa0 fs/hugetlbfs/inode.c:493 evict+0x481/0x920 fs/inode.c:553 iput_final fs/inode.c:1515 [inline] iput+0x62b/0xa20 fs/inode.c:1542 hugetlb_file_setup+0x593/0x9f0 fs/hugetlbfs/inode.c:1306 newseg+0x422/0xd30 ipc/shm.c:575 ipcget_new ipc/util.c:285 [inline] ipcget+0x21e/0x580 ipc/util.c:639 SYSC_shmget ipc/shm.c:673 [inline] SyS_shmget+0x158/0x230 ipc/shm.c:657 entry_SYSCALL_64_fastpath+0x1f/0xc2 RIP: 0033:0x445b79 RSP: 002b:00007f273aba1858 EFLAGS: 00000282 ORIG_RAX: 000000000000001d RAX: ffffffffffffffda RBX: 0000000000708000 RCX: 0000000000445b79 RDX: 0000000000000900 RSI: 0000000000003000 RDI: 0000000000000000 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000282 R12: 00000000004a7e31 R13: 0000000000000000 R14: 00007f273aba1618 R15: 00007f273aba1788 Code: 00 fc ff df 48 c7 04 01 00 00 00 00 c7 44 08 08 00 00 00 00 48 81 c4 88 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 ab a5 d5 ff <0f> 0b 48 8b bd 70 ff ff ff e8 ad c0 03 00 e9 2c fe ff ff e8 a3 RIP: resv_map_release+0x265/0x330 mm/hugetlb.c:742 RSP: ffff88003daa7830 ---[ end trace 575ce95655b30bd0 ]--- On commit 093b995e3b55a0ae0670226ddfcb05bfbf0099ae -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
