On Thu, 29 Oct 2020 at 18:45, Dmitry Osipenko <digetx@xxxxxxxxx> wrote: > > 19.10.2020 11:41, Linus Walleij пишет: > > This is the 16th and final (knock on wood) version of > > KASan for ARM32. > > Hi, > > I tried KASAN on NVIDIA Tegra using next-20201029 and getting a (seems) > bogus bug report saying that the bug is in the KASAN code (note > udc_irq() belongs to the ChipIdea USB driver), this problem doesn't > happen using one of older versions of the KASAN patches. > That is probably a coincidence. I ran into the same thing: https://lore.kernel.org/linux-arm-kernel/20201029001753.717-1-ardb@xxxxxxxxxx/ I am not sure this is the right fix, but it does silence the warning for me. > [ 27.700859] > ================================================================== > [ 27.720575] BUG: KASAN: stack-out-of-bounds in save_trace+0xbf/0xf8 > [ 27.740119] Read of size 4 at addr c4dc7038 by task kworker/0:1H/124 > > [ 27.778724] CPU: 0 PID: 124 Comm: kworker/0:1H Tainted: G W > 5.10.0-rc1-next-20201029-00144-g367ba7b6ebb4 #4327 > [ 27.818361] Hardware name: NVIDIA Tegra SoC (Flattened Device Tree) > [ 27.838599] Workqueue: mmc_complete mmc_blk_mq_complete_work > [ 27.858795] [<c0111a05>] (unwind_backtrace) from [<c010c26d>] > (show_stack+0x11/0x14) > [ 27.879038] [<c010c26d>] (show_stack) from [<c0f42e5b>] > (dump_stack+0x8b/0xa0) > [ 27.899374] [<c0f42e5b>] (dump_stack) from [<c031d8f7>] > (print_address_description.constprop.0+0x2b/0x360) > [ 27.939249] [<c031d8f7>] (print_address_description.constprop.0) from > [<c031ddab>] (kasan_report+0x103/0x11c) > [ 27.979769] [<c031ddab>] (kasan_report) from [<c010bddb>] > (save_trace+0xbf/0xf8) > [ 28.000506] [<c010bddb>] (save_trace) from [<c010bd11>] > (walk_stackframe+0x19/0x24) > [ 28.021501] [<c010bd11>] (walk_stackframe) from [<c010bf07>] > (__save_stack_trace+0xf3/0xf8) > [ 28.042658] [<c010bf07>] (__save_stack_trace) from [<c01b8c4d>] > (stack_trace_save+0x75/0x8c) > [ 28.063740] [<c01b8c4d>] (stack_trace_save) from [<c031d019>] > (kasan_save_stack+0x11/0x28) > [ 28.084979] [<c031d019>] (kasan_save_stack) from [<c031d04d>] > (kasan_set_track+0x1d/0x20) > [ 28.106135] [<c031d04d>] (kasan_set_track) from [<c031e461>] > (kasan_set_free_info+0x19/0x20) > [ 28.127351] [<c031e461>] (kasan_set_free_info) from [<c031cfe5>] > (__kasan_slab_free+0xa5/0xc8) > [ 28.148491] [<c031cfe5>] (__kasan_slab_free) from [<c0318b7f>] > (kfree+0x7b/0x374) > [ 28.169910] [<c0318b7f>] (kfree) from [<c09bbe7f>] (udc_irq+0x477/0xe18) > [ 28.191214] [<c09bbe7f>] (udc_irq) from [<c019cb09>] > (__handle_irq_event_percpu+0x71/0x2d4) > [ 28.212693] [<c019cb09>] (__handle_irq_event_percpu) from > [<c019cde1>] (handle_irq_event_percpu+0x75/0xb8) > [ 28.255076] [<c019cde1>] (handle_irq_event_percpu) from [<c019ce67>] > (handle_irq_event+0x43/0x64) > [ 28.277174] [<c019ce67>] (handle_irq_event) from [<c01a1bbb>] > (handle_fasteoi_irq+0xcf/0x18c) > [ 28.299436] [<c01a1bbb>] (handle_fasteoi_irq) from [<c019bd4b>] > (generic_handle_irq+0x3b/0x44) > [ 28.321825] [<c019bd4b>] (generic_handle_irq) from [<c019c34b>] > (__handle_domain_irq+0x5f/0xa8) > [ 28.344383] [<c019c34b>] (__handle_domain_irq) from [<c06b30cf>] > (gic_handle_irq+0x87/0x9c) > [ 28.367176] [<c06b30cf>] (gic_handle_irq) from [<c0100b23>] > (__irq_svc+0x63/0xb0) > [ 28.390118] Exception stack(0xc4dc6f58 to 0xc4dc6fa0) > [ 28.413200] 6f40: > c1fa88c4 00000000 > [ 28.436622] 6f60: c1fa88c4 00000000 c5557800 00000000 00000001 > c5557808 00000001 c1fa88c0 > [ 28.460176] 6f80: 00000000 c466c000 b782c97b c4dc6fac c0bdcfa1 > c0bdd51e 60070133 ffffffff > [ 28.484070] [<c0100b23>] (__irq_svc) from [<c0bdd51e>] > (__qdisc_run+0x6d2/0x7b8) > [ 28.508082] [<c0bdd51e>] (__qdisc_run) from [<c0100155>] > (ret_from_fork+0x11/0x1c) > [ 28.532185] Exception stack(0xc4dc6ffc to 0xc4dc7044) > [ 28.556578] 6fe0: > 00000000 > [ 28.581249] 7000: c1902d18 c4dc8000 00000000 00000000 00000003 > 00000000 00000000 00000001 > [ 28.605909] 7020: 41b58ab3 c1864c40 c0b94e6c 00000800 00000000 > c2c01e00 00000001 c09bbe7f > [ 28.630740] 7040: fffffff4 > > [ 28.679636] The buggy address belongs to the page: > [ 28.704480] page:bc50e6d8 refcount:0 mapcount:0 mapping:00000000 > index:0x0 pfn:0x84dc7 > [ 28.729687] flags: 0x0() > [ 28.754372] raw: 00000000 defa7000 defa7000 00000000 00000000 > 00000000 ffffffff 00000000 > [ 28.779394] raw: 00000000 > [ 28.804339] page dumped because: kasan: bad access detected > > [ 28.854326] addr c4dc7038 is located in stack of task > kworker/0:1H/124 at offset 24 in frame: > [ 28.880073] __dev_queue_xmit+0x0/0x9cc > > [ 28.931135] this frame has 4 objects: > [ 28.956624] [32, 36) 'rc' > [ 28.956638] [48, 52) 'to_free' > [ 28.981922] [64, 72) '_udphdr' > [ 29.007038] [96, 116) '_tcphdr' > > [ 29.081989] Memory state around the buggy address: > [ 29.106884] c4dc6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 29.132106] c4dc6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 29.157134] >c4dc7000: 00 00 00 00 f1 f1 f1 f1 04 f2 04 f2 00 f2 f2 f2 > [ 29.181980] ^ > [ 29.206867] c4dc7080: 00 00 04 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 > [ 29.231827] c4dc7100: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f3 f3 f3 > [ 29.257034] > ================================================================== >
