On 10/12/2015 11:55 AM, Dmitry Vyukov wrote:
Hello, The following program crashes kernel: // autogenerated by syzkaller (http://github.com/google/syzkaller) #include <syscall.h> #include <string.h> #include <stdint.h> int main() { long r0 = syscall(SYS_shmget, 0x0ul, 0x2ul, 0x8ul); long r1 = syscall(SYS_shmat, r0, 0x20000000ul, 0x0ul); long r2 = syscall(SYS_mremap, 0x20000000ul, 0x1000ul, 0x3000ul, 0x3ul, 0x207f9000ul); long r19 = syscall(SYS_shmctl, r0, 0x0ul, 0); long r20 = syscall(SYS_remap_file_pages, 0x207f9000ul, 0x3000ul, 0x0ul, 0x7ul, 0x0ul); return 0; } On commit dd36d7393d6310b0c1adefb22fba79c3cf8a577c (git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git) ------------[ cut here ]------------ WARNING: CPU: 2 PID: 2636 at ipc/shm.c:162 shm_open+0x74/0x80() Modules linked in: CPU: 2 PID: 2636 Comm: a.out Not tainted 4.3.0-rc3+ #37 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 ffffffff81bcb43c ffff88081bf0bd70 ffffffff812fe8d6 0000000000000000 ffff88081bf0bda8 ffffffff81051ff1 ffffffffffffffea ffff88081b896ca8 ffff880819b81620 ffff8800bbaa6d00 ffff880819b81600 ffff88081bf0bdb8 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff812fe8d6>] dump_stack+0x44/0x5e lib/dump_stack.c:50 [<ffffffff81051ff1>] warn_slowpath_common+0x81/0xc0 kernel/panic.c:447 [<ffffffff810520e5>] warn_slowpath_null+0x15/0x20 kernel/panic.c:480 [< inline >] shm_lock ipc/shm.c:162 [<ffffffff81295c64>] shm_open+0x74/0x80 ipc/shm.c:196 [<ffffffff81295cbe>] shm_mmap+0x4e/0x80 ipc/shm.c:399 (discriminator 2) [<ffffffff81142d14>] mmap_region+0x3c4/0x5e0 mm/mmap.c:1627 [<ffffffff81143227>] do_mmap+0x2f7/0x3d0 mm/mmap.c:1402 [< inline >] do_mmap_pgoff include/linux/mm.h:1930 [< inline >] SYSC_remap_file_pages mm/mmap.c:2694
Hmm what kind of stack unwinder catches inlines? Some external patch, based on debuginfo?
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