Hello, The following program triggers multiple bugs including bad page state warnings and GPFs: // autogenerated by syzkaller (http://github.com/google/syzkaller) #include <syscall.h> #include <string.h> #include <stdint.h> #include <unistd.h> void foo() { long r0 = syscall(SYS_socket, 0x26ul, 0x5ul, 0x0ul, 0, 0, 0); long r1 = syscall(SYS_mmap, 0x20000000ul, 0x10000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul); *(uint16_t*)0x20001000 = 0x26; memcpy((void*)0x20001002, "\x73\x6b\x63\x69\x70\x68\x65\x72\x00\x00\x00\x00\x00\x00", 14); *(uint32_t*)0x20001010 = 0xf; *(uint32_t*)0x20001014 = 0x100; memcpy((void*)0x20001018, "\x65\x63\x62\x28\x73\x65\x72\x70\x65\x6e\x74\x29\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 64); long r7 = syscall(SYS_bind, r0, 0x20001000ul, 0x58ul, 0, 0, 0); long r8 = syscall(SYS_accept4, r0, 0x0ul, 0x200023fdul, 0x800ul, 0, 0); memcpy((void*)0x20000000, 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4096); memcpy((void*)0x20000000, "\x04\x00", 2); long r11 = syscall(SYS_sendto, r8, 0x20000000ul, 0x1000ul, 0x4004ul, 0x20000000ul, 0x2ul); memcpy((void*)0x20000ff9, "\x01\x00\x2e\x2f\x66\x69\x6c\x65\x30\x00", 10); long r13 = syscall(SYS_recvfrom, r8, 0x20002fbcul, 0x5aul, 0x10040ul, 0x20000ff9ul, 0xaul); } int main() { int i; for (i = 0; i < 10; i++) { if (fork() == 0) foo(); } } BUG: Bad page state in process stress pfn:65d71 page:ffffea0001975c40 count:-1 mapcount:0 mapping: (null) index:0x0 flags: 0x5fffc0000000000() page dumped because: nonzero _count Modules linked in: CPU: 3 PID: 6985 Comm: stress Not tainted 4.4.0-rc3+ #151 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 0000000000000003 ffff8800631a7430 ffffffff82e0f4b8 0000000041b58ab3 ffffffff87a9a265 ffffffff82e0f406 0000000000000000 0000000000000000 ffffffff86bc6e80 ffffea0001975c5c ffff8800631a7430 ffffffff817b53a5 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff82e0f4b8>] dump_stack+0xb2/0xfa lib/dump_stack.c:50 [<ffffffff81725cc5>] bad_page+0x1c5/0x250 mm/page_alloc.c:438 [< inline >] check_new_page mm/page_alloc.c:1358 [< inline >] prep_new_page mm/page_alloc.c:1371 [<ffffffff81736bb3>] get_page_from_freelist+0xbb3/0x2790 mm/page_alloc.c:2584 [<ffffffff81738d31>] __alloc_pages_nodemask+0x2a1/0x1ad0 mm/page_alloc.c:3225 [<ffffffff81827aad>] alloc_pages_current+0xfd/0x3a0 mm/mempolicy.c:2055 [< inline >] alloc_pages include/linux/gfp.h:451 [< inline >] pmd_alloc_one ./arch/x86/include/asm/pgalloc.h:84 [<ffffffff817c1e88>] __pmd_alloc+0x28/0x390 mm/memory.c:3490 [< inline >] pmd_alloc include/linux/mm.h:1496 [< inline >] copy_pmd_range mm/memory.c:958 [< inline >] copy_pud_range mm/memory.c:999 [<ffffffff817c8738>] copy_page_range+0x12d8/0x1990 mm/memory.c:1061 [< inline >] dup_mmap kernel/fork.c:505 [< inline >] dup_mm kernel/fork.c:929 [< inline >] copy_mm kernel/fork.c:983 [<ffffffff8136efec>] copy_process+0x4f1c/0x6a90 kernel/fork.c:1450 [<ffffffff81370e5b>] _do_fork+0x14b/0xf00 kernel/fork.c:1727 [< inline >] SYSC_clone kernel/fork.c:1836 [<ffffffff81371ce7>] SyS_clone+0x37/0x50 kernel/fork.c:1830 [<ffffffff86a89fb6>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185 Disabling lock debugging due to kernel taint BUG: Bad page state in process stress pfn:64f0d page:ffffea000193c340 count:-1 mapcount:0 mapping: (null) index:0x0 flags: 0x5fffc0000000000() page dumped because: nonzero _count Modules linked in: CPU: 2 PID: 7163 Comm: stress Tainted: G B 4.4.0-rc3+ #151 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 0000000000000002 ffff880036f2f6a0 ffffffff82e0f4b8 0000000041b58ab3 ffffffff87a9a265 ffffffff82e0f406 0000000000000000 0000000000000000 ffffffff86bc6e80 ffffea000193c35c ffff880036f2f6a0 ffffffff817b53a5 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff82e0f4b8>] dump_stack+0xb2/0xfa lib/dump_stack.c:50 [<ffffffff81725cc5>] bad_page+0x1c5/0x250 mm/page_alloc.c:438 [< inline >] check_new_page mm/page_alloc.c:1358 [< inline >] prep_new_page mm/page_alloc.c:1371 [<ffffffff81736bb3>] get_page_from_freelist+0xbb3/0x2790 mm/page_alloc.c:2584 [<ffffffff81738d31>] __alloc_pages_nodemask+0x2a1/0x1ad0 mm/page_alloc.c:3225 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Modules linked in: CPU: 3 PID: 7168 Comm: a.out Tainted: G B 4.4.0-rc3+ #151 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88003712ad00 ti: ffff8800331d8000 task.ti: ffff8800331d8000 RIP: 0010:[<ffffffff82d2d812>] [<ffffffff82d2d812>] skcipher_recvmsg+0x82/0x1f10 RSP: 0018:ffff8800331dfb80 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: ffff88006b98f300 RCX: 0000000000010040 RDX: 0000000000000002 RSI: ffff8800331dfdc0 RDI: 0000000000000016 RBP: ffff8800331dfc80 R08: ffff8800331dfdd0 R09: 000000000000000a R10: 0000000000010040 R11: 0000000000000246 R12: 0000000000000006 R13: ffff8800331dfdc0 R14: ffff8800331dfdc0 R15: 0000000000010040 FS: 0000000002630880(0063) GS:ffff88006cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 000000c8200d73b0 CR3: 0000000064c58000 CR4: 00000000000006e0 Stack: ffff88006aba6024 ffff88006ab24520 ffff88006ab24510 ffff88006aba67e0 ffff88006aba602c ffffed000d574cfc 0000000000000000 ffff88006ab24518 ffff88006aba602d 0000000000001000 ffff88006ab24500 ffff88006aba6a48 Call Trace: [< inline >] sock_recvmsg_nosec net/socket.c:712 [<ffffffff856b1c8a>] sock_recvmsg+0xaa/0xe0 net/socket.c:720 [<ffffffff856b2424>] SYSC_recvfrom+0x1e4/0x370 net/socket.c:1707 [<ffffffff856b7570>] SyS_recvfrom+0x40/0x50 net/socket.c:1681 [<ffffffff86a89fb6>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185 Code: 8b 45 c8 4c 8b 60 50 4d 85 e4 0f 84 0f 0a 00 00 e8 c4 a7 8d fe 49 8d 7c 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ea 16 00 00 49 83 7c 24 10 00 0f 84 de 09 00 RIP [< inline >] is_sync_kiocb include/linux/fs.h:333 RIP [<ffffffff82d2d812>] skcipher_recvmsg+0x82/0x1f10 crypto/algif_skcipher.c:705 RSP <ffff8800331dfb80> ---[ end trace a867d3766397dba1 ]--- [<ffffffff81827aad>] alloc_pages_current+0xfd/0x3a0 mm/mempolicy.c:2055 [< inline >] alloc_pages include/linux/gfp.h:451 [<ffffffff8129e017>] pte_alloc_one+0x17/0xb0 arch/x86/mm/pgtable.c:28 [<ffffffff817bdbcd>] __pte_alloc+0x2d/0x450 mm/memory.c:568 [< inline >] __handle_mm_fault mm/memory.c:3400 [<ffffffff817c3aeb>] handle_mm_fault+0x18fb/0x4100 mm/memory.c:3442 [<ffffffff8129093c>] __do_page_fault+0x2ec/0x970 arch/x86/mm/fault.c:1238 [<ffffffff812910a3>] trace_do_page_fault+0xb3/0x3c0 arch/x86/mm/fault.c:1331 [<ffffffff81280584>] do_async_page_fault+0x14/0x70 arch/x86/kernel/kvm.c:264 [<ffffffff86a8bf18>] async_page_fault+0x28/0x30 arch/x86/entry/entry_64.S:977 On upstream commit 31ade3b83e1821da5fbb2f11b5b3d4ab2ec39db8 (Nov 29). -- To unsubscribe 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