Hello, The following program triggers WARN_ON_ONCE(!list_empty(&ctx->flc_posix)) warning in locks_free_lock_context (run it in a loop): // autogenerated by syzkaller (http://github.com/google/syzkaller) #include <unistd.h> #include <sys/syscall.h> #include <string.h> #include <stdint.h> #include <pthread.h> #ifndef SYS_memfd_create #define SYS_memfd_create 319 #endif long r[15]; long done[14]; void *thr(void *arg) { if (rand()%2) usleep(100); switch ((long)arg) { case 0: r[0] = syscall(SYS_mmap, 0x20000000ul, 0x5000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul); break; case 1: memcpy((void*)0x20000c49, "\xb6\x70\x70\x70\x31\x73\x65\x63\x75\x72\x69\x74\x79\x9e\x00", 15); r[2] = syscall(SYS_memfd_create, 0x20000c49ul, 0x3ul, 0, 0, 0, 0); break; case 2: r[3] = syscall(SYS_socketpair, 0x1ul, 0x1ul, 0x0ul, 0x20001000ul, 0, 0); if (r[3] != -1) r[4] = *(uint32_t*)0x20001000; if (r[3] != -1) r[5] = *(uint32_t*)0x20001004; break; case 3: *(uint16_t*)0x20000000 = (uint16_t)0x0; *(uint16_t*)0x20000002 = (uint16_t)0x1; *(uint64_t*)0x20000008 = (uint64_t)0x6; *(uint64_t*)0x20000010 = (uint64_t)0xad; *(uint32_t*)0x20000018 = (uint32_t)0x0; r[11] = syscall(SYS_fcntl, r[5], 0x7ul, 0x20000000ul, 0, 0, 0); break; case 4: r[12] = syscall(SYS_write, r[5], 0x200006cbul, 0x1000ul, 0, 0, 0); break; case 5: r[13] = syscall(SYS_close, r[5], 0, 0, 0, 0, 0); break; case 6: r[14] = syscall(SYS_dup2, r[2], r[4], 0, 0, 0, 0); break; } done[(long)arg] = 1; return 0; } int main() { long i, j; pthread_t th[14]; srand(time(0)+getpid()); memset(r, -1, sizeof(r)); for (i = 0; i < 7; i++) { pthread_create(&th[i], 0, thr, (void*)i); for (j = 0; j < 10; j++) { if (done[i]) break; usleep(100); } } for (i = 0; i < 7; i++) done[i] = 0; for (i = 0; i < 7; i++) { pthread_create(&th[7+i], 0, thr, (void*)i); if (rand()%2) continue; for (j = 0; j < 10; j++) { if (done[i]) break; usleep(100); } } usleep(100); return 0; } ------------[ cut here ]------------ WARNING: CPU: 3 PID: 1975 at fs/locks.c:241 locks_free_lock_context+0x118/0x180() Modules linked in: CPU: 3 PID: 1975 Comm: a.out Not tainted 4.4.0-rc6+ #173 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 00000000ffffffff ffff880068e67bf8 ffffffff82899ffd 0000000000000000 ffff88006130af00 ffffffff85e17d60 ffff880068e67c38 ffffffff812ebbb9 ffffffff818162d8 ffffffff85e17d60 00000000000000f1 ffff8800685c2828 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff82899ffd>] dump_stack+0x6f/0xa2 lib/dump_stack.c:50 [<ffffffff812ebbb9>] warn_slowpath_common+0xd9/0x140 kernel/panic.c:460 [<ffffffff812ebde9>] warn_slowpath_null+0x29/0x30 kernel/panic.c:493 [<ffffffff818162d8>] locks_free_lock_context+0x118/0x180 fs/locks.c:241 [<ffffffff81765783>] __destroy_inode+0x1d3/0x4d0 fs/inode.c:228 [<ffffffff81765acb>] destroy_inode+0x4b/0x120 fs/inode.c:253 [<ffffffff81765ec0>] evict+0x320/0x4f0 fs/inode.c:559 [< inline >] iput_final fs/inode.c:1477 [<ffffffff817665dc>] iput+0x45c/0x850 fs/inode.c:1504 [< inline >] dentry_iput fs/dcache.c:358 [<ffffffff81757237>] __dentry_kill+0x457/0x620 fs/dcache.c:543 [< inline >] dentry_kill fs/dcache.c:587 [<ffffffff8175c499>] dput+0x659/0x740 fs/dcache.c:796 [<ffffffff817162fc>] __fput+0x42c/0x780 fs/file_table.c:226 [<ffffffff817166d5>] ____fput+0x15/0x20 fs/file_table.c:244 [<ffffffff8134679b>] task_work_run+0x16b/0x200 kernel/task_work.c:115 [< inline >] tracehook_notify_resume include/linux/tracehook.h:191 [<ffffffff81003990>] exit_to_usermode_loop+0x180/0x1a0 arch/x86/entry/common.c:251 [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:282 [<ffffffff8100631f>] syscall_return_slowpath+0x19f/0x210 arch/x86/entry/common.c:344 [<ffffffff85ccea22>] int_ret_from_sys_call+0x25/0x9f arch/x86/entry/entry_64.S:281 ---[ end trace 2dde0624dd974a19 ]--- On commit 4ef7675344d687a0ef5b0d7c0cee12da005870c0 (Dec 20). -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
