On Wed, Nov 01, 2017 at 01:02:27PM -0700, Andrew Morton wrote: > Begin forwarded message: > > Date: Wed, 01 Nov 2017 12:54:16 -0700 > From: syzbot <bot+63583aefef5457348dcfa06b87d4fd1378b26b09@xxxxxxxxxxxxxxxxxxxxxxxxx> > To: aaron.lu@xxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, aneesh.kumar@xxxxxxxxxxxxxxxxxx, jack@xxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, mhocko@xxxxxxxx, minchan@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, rientjes@xxxxxxxxxx, sfr@xxxxxxxxxxxxxxxx, shli@xxxxxx, syzkaller-bugs@xxxxxxxxxxxxxxxx, willy@xxxxxxxxxxxxxxx, ying.huang@xxxxxxxxx, zi.yan@xxxxxxxxxxxxxx > Subject: BUG: soft lockup > > > Hello, > > syzkaller hit the following crash on > 1d53d908b79d7870d89063062584eead4cf83448 > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > C reproducer is attached > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers Sorry to be the bringer of bad news but after: 4842e98f26dd80be3623c4714a244ba52ea096a8 and 7e1d90f60a0d501c8503e636942ca704a454d910 The attached syzkaller repro trigger a softlockup in workqueue. I am unfamiliar with that code so some familiar in that domain is more likely to find a proper solution. Note with git revert 7e1d90f60a0d501c8503e636942ca704a454d910 git revert 4842e98f26dd80be3623c4714a244ba52ea096a8 fix the issue Cheers, Jérôme
// autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include <fcntl.h> #include <stdint.h> #include <stdio.h> #include <string.h> #include <sys/stat.h> #include <sys/syscall.h> #include <unistd.h> static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2) { if (a0 == 0xc || a0 == 0xb) { char buf[128]; sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); return open(buf, O_RDWR, 0); } else { char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf)); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } static void test(); void loop() { while (1) { test(); } } long r[64]; void test() { memset(r, -1, sizeof(r)); r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul); memcpy((void*)0x203a2000, "\x2e\x2f\x66\x69\x6c\x65\x30\x00", 8); *(uint64_t*)0x20000fe0 = (uint64_t)0x0; *(uint64_t*)0x20000fe8 = (uint64_t)0x2710; *(uint64_t*)0x20000ff0 = (uint64_t)0x77359400; *(uint64_t*)0x20000ff8 = (uint64_t)0x0; r[6] = syscall(__NR_utimes, 0x203a2000ul, 0x20000fe0ul); r[7] = syscall(__NR_getdents64, 0xfffffffffffffffful, 0x2076e000ul, 0x0ul); memcpy((void*)0x20c67ff1, "\x2f\x64\x65\x76\x2f\x73\x6e\x64\x2f\x74\x69\x6d\x65\x72\x00", 15); r[9] = syz_open_dev(0x20c67ff1ul, 0x0ul, 0x0ul); *(uint32_t*)0x205a3fcc = (uint32_t)0x0; *(uint32_t*)0x205a3fd0 = (uint32_t)0x2; *(uint32_t*)0x205a3fd4 = (uint32_t)0x0; *(uint32_t*)0x205a3fd8 = (uint32_t)0xffffffffffffffff; *(uint32_t*)0x205a3fdc = (uint32_t)0x0; *(uint8_t*)0x205a3fe0 = (uint8_t)0x0; *(uint8_t*)0x205a3fe1 = (uint8_t)0x0; *(uint8_t*)0x205a3fe2 = (uint8_t)0x0; *(uint8_t*)0x205a3fe3 = (uint8_t)0x0; *(uint8_t*)0x205a3fe4 = (uint8_t)0x0; *(uint8_t*)0x205a3fe5 = (uint8_t)0x0; *(uint8_t*)0x205a3fe6 = (uint8_t)0x0; *(uint8_t*)0x205a3fe7 = (uint8_t)0x0; *(uint8_t*)0x205a3fe8 = (uint8_t)0x0; *(uint8_t*)0x205a3fe9 = (uint8_t)0x0; *(uint8_t*)0x205a3fea = (uint8_t)0x0; *(uint8_t*)0x205a3feb = (uint8_t)0x0; *(uint8_t*)0x205a3fec = (uint8_t)0x0; *(uint8_t*)0x205a3fed = (uint8_t)0x0; *(uint8_t*)0x205a3fee = (uint8_t)0x0; *(uint8_t*)0x205a3fef = (uint8_t)0x0; *(uint8_t*)0x205a3ff0 = (uint8_t)0x0; *(uint8_t*)0x205a3ff1 = (uint8_t)0x0; *(uint8_t*)0x205a3ff2 = (uint8_t)0x0; *(uint8_t*)0x205a3ff3 = (uint8_t)0x0; *(uint8_t*)0x205a3ff4 = (uint8_t)0x0; *(uint8_t*)0x205a3ff5 = (uint8_t)0x0; *(uint8_t*)0x205a3ff6 = (uint8_t)0x0; *(uint8_t*)0x205a3ff7 = (uint8_t)0x0; *(uint8_t*)0x205a3ff8 = (uint8_t)0x0; *(uint8_t*)0x205a3ff9 = (uint8_t)0x0; *(uint8_t*)0x205a3ffa = (uint8_t)0x0; *(uint8_t*)0x205a3ffb = (uint8_t)0x0; *(uint8_t*)0x205a3ffc = (uint8_t)0x0; *(uint8_t*)0x205a3ffd = (uint8_t)0x0; *(uint8_t*)0x205a3ffe = (uint8_t)0x0; *(uint8_t*)0x205a3fff = (uint8_t)0x0; r[47] = syscall(__NR_ioctl, r[9], 0x40345410ul, 0x205a3fccul); r[48] = syscall(__NR_ioctl, r[9], 0x54a2ul); memcpy((void*)0x20bd8000, "\x2f\x64\x65\x76\x2f\x73\x65\x71\x75\x65\x6e\x63\x65\x72\x32" "\x00", 16); r[50] = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20bd8000ul, 0x101000ul, 0x0ul); *(uint32_t*)0x20d1e000 = (uint32_t)0xffffffffffffffff; *(uint32_t*)0x20d1e004 = (uint32_t)0x730e; *(uint32_t*)0x20d1e008 = (uint32_t)0x7; *(uint32_t*)0x20d1e00c = (uint32_t)0x3; *(uint8_t*)0x20d1e010 = (uint8_t)0xffffffffffffffff; *(uint8_t*)0x20d1e011 = (uint8_t)0x80000001; *(uint8_t*)0x20d1e012 = (uint8_t)0x4610; *(uint8_t*)0x20d1e013 = (uint8_t)0x9; *(uint32_t*)0x20d1e014 = (uint32_t)0x8; *(uint32_t*)0x20d1e018 = (uint32_t)0x9; *(uint32_t*)0x20d1e01c = (uint32_t)0x7; *(uint32_t*)0x20d1e020 = (uint32_t)0x1; r[63] = syscall(__NR_ioctl, r[50], 0x5402ul, 0x20d1e000ul); } int main() { int i; for (i = 0; i < 8; i++) { if (fork() == 0) { loop(); return 0; } } sleep(1000000); return 0; }
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