Messages in this thread | | | From | Shankara Pailoor <> | Date | Sun, 15 Oct 2017 08:28:55 -0400 | Subject | WARNING in per_cpu_alloc |
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Hi,
We found the warning when fuzzing with Syzkaller on Linux 4-14-rc4.
illegal size (32776) or align (8) for percpu allocation ------------[ cut here ]------------ WARNING: CPU: 0 PID: 22596 at mm/percpu.c:1365 pcpu_alloc+0x140/0x10f0 Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 22596 Comm: syz-executor1 Not tainted 4.14.0-rc4 #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: dump_stack+0x115/0x1da panic+0x1b4/0x3a7 __warn+0x1c4/0x1d9 report_bug+0x211/0x2d0 fixup_bug+0x40/0x90 do_trap+0x260/0x390 do_error_trap+0x11c/0x350 do_invalid_op+0x1b/0x20 invalid_op+0x18/0x20 RIP: 0010:pcpu_alloc+0x140/0x10f0 RSP: 0018:ffff8800a752f6a8 EFLAGS: 00010286 RAX: 0000000000000037 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000037 RSI: ffffc90001a32000 RDI: ffffed0014ea5ec9 RBP: ffff8800a752f920 R08: ffff8800a752ed98 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008007 R13: 0000000000000000 R14: ffff8800a752fec0 R15: 0000000000000008 __alloc_percpu+0x24/0x30 dev_map_alloc+0x68e/0xb70 SyS_bpf+0xd25/0x4500 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x452349 RSP: 002b:00007f8c38897be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000968000 RCX: 0000000000452349 RDX: 000000000000001c RSI: 0000000020038000 RDI: 0000000000000000 RBP: 0000000000000046 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f25a8 R13: 00000000ffffffff R14: 0000000000968070 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: 0x23800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) Rebooting in 86400 seconds..
Here is the reproducer program: https://pastebin.com/TdSTCu5E
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