On Fri, Nov 29, 2019 at 11:58 AM Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > > On Fri, Nov 29, 2019 at 11:43 AM Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > > > > On Tue, Nov 19, 2019 at 10:54 AM Andrey Ryabinin > > <aryabinin@xxxxxxxxxxxxx> wrote: > > > On 11/18/19 6:29 AM, Daniel Axtens wrote: > > > > Qian Cai <cai@xxxxxx> writes: > > > > > > > >> On Thu, 2019-10-31 at 20:39 +1100, Daniel Axtens wrote: > > > >>> /* > > > >>> * In this function, newly allocated vm_struct has VM_UNINITIALIZED > > > >>> * flag. It means that vm_struct is not fully initialized. > > > >>> @@ -3377,6 +3411,9 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, > > > >>> > > > >>> setup_vmalloc_vm_locked(vms[area], vas[area], VM_ALLOC, > > > >>> pcpu_get_vm_areas); > > > >>> + > > > >>> + /* assume success here */ > > > >>> + kasan_populate_vmalloc(sizes[area], vms[area]); > > > >>> } > > > >>> spin_unlock(&vmap_area_lock); > > > >> > > > >> Here it is all wrong. GFP_KERNEL with in_atomic(). > > > > > > > > I think this fix will work, I will do a v12 with it included. > > > > > > You can send just the fix. Andrew will fold it into the original patch before sending it to Linus. > > > > > > > > > > > > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > > > > index a4b950a02d0b..bf030516258c 100644 > > > > --- a/mm/vmalloc.c > > > > +++ b/mm/vmalloc.c > > > > @@ -3417,11 +3417,14 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, > > > > > > > > setup_vmalloc_vm_locked(vms[area], vas[area], VM_ALLOC, > > > > pcpu_get_vm_areas); > > > > + } > > > > + spin_unlock(&vmap_area_lock); > > > > > > > > + /* populate the shadow space outside of the lock */ > > > > + for (area = 0; area < nr_vms; area++) { > > > > /* assume success here */ > > > > kasan_populate_vmalloc(sizes[area], vms[area]); > > > > } > > > > - spin_unlock(&vmap_area_lock); > > > > > > > > kfree(vas); > > > > return vms; > > > > Hi, > > > > I am testing this support on next-20191129 and seeing the following warnings: > > > > BUG: sleeping function called from invalid context at mm/page_alloc.c:4681 > > in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 44, name: kworker/1:1 > > 4 locks held by kworker/1:1/44: > > #0: ffff888067c26d28 ((wq_completion)events){+.+.}, at: > > __write_once_size include/linux/compiler.h:247 [inline] > > #0: ffff888067c26d28 ((wq_completion)events){+.+.}, at: > > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > > #0: ffff888067c26d28 ((wq_completion)events){+.+.}, at: atomic64_set > > include/asm-generic/atomic-instrumented.h:868 [inline] > > #0: ffff888067c26d28 ((wq_completion)events){+.+.}, at: > > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > > #0: ffff888067c26d28 ((wq_completion)events){+.+.}, at: set_work_data > > kernel/workqueue.c:615 [inline] > > #0: ffff888067c26d28 ((wq_completion)events){+.+.}, at: > > set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] > > #0: ffff888067c26d28 ((wq_completion)events){+.+.}, at: > > process_one_work+0x88b/0x1750 kernel/workqueue.c:2235 > > #1: ffffc900002afdf0 (pcpu_balance_work){+.+.}, at: > > process_one_work+0x8c0/0x1750 kernel/workqueue.c:2239 > > #2: ffffffff8943f080 (pcpu_alloc_mutex){+.+.}, at: > > pcpu_balance_workfn+0xcc/0x13e0 mm/percpu.c:1845 > > #3: ffffffff89450c78 (vmap_area_lock){+.+.}, at: spin_lock > > include/linux/spinlock.h:338 [inline] > > #3: ffffffff89450c78 (vmap_area_lock){+.+.}, at: > > pcpu_get_vm_areas+0x1449/0x3df0 mm/vmalloc.c:3431 > > Preemption disabled at: > > [<ffffffff81a84199>] spin_lock include/linux/spinlock.h:338 [inline] > > [<ffffffff81a84199>] pcpu_get_vm_areas+0x1449/0x3df0 mm/vmalloc.c:3431 > > CPU: 1 PID: 44 Comm: kworker/1:1 Not tainted 5.4.0-next-20191129+ #5 > > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.12.0-1 04/01/2014 > > Workqueue: events pcpu_balance_workfn > > Call Trace: > > __dump_stack lib/dump_stack.c:77 [inline] > > dump_stack+0x199/0x216 lib/dump_stack.c:118 > > ___might_sleep.cold.97+0x1f5/0x238 kernel/sched/core.c:6800 > > __might_sleep+0x95/0x190 kernel/sched/core.c:6753 > > prepare_alloc_pages mm/page_alloc.c:4681 [inline] > > __alloc_pages_nodemask+0x3cd/0x890 mm/page_alloc.c:4730 > > alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2211 > > alloc_pages include/linux/gfp.h:532 [inline] > > __get_free_pages+0xc/0x40 mm/page_alloc.c:4786 > > kasan_populate_vmalloc_pte mm/kasan/common.c:762 [inline] > > kasan_populate_vmalloc_pte+0x2f/0x1b0 mm/kasan/common.c:753 > > apply_to_pte_range mm/memory.c:2041 [inline] > > apply_to_pmd_range mm/memory.c:2068 [inline] > > apply_to_pud_range mm/memory.c:2088 [inline] > > apply_to_p4d_range mm/memory.c:2108 [inline] > > apply_to_page_range+0x5ca/0xa00 mm/memory.c:2133 > > kasan_populate_vmalloc+0x69/0xa0 mm/kasan/common.c:791 > > pcpu_get_vm_areas+0x1596/0x3df0 mm/vmalloc.c:3439 > > pcpu_create_chunk+0x240/0x7f0 mm/percpu-vm.c:340 > > pcpu_balance_workfn+0x1033/0x13e0 mm/percpu.c:1934 > > process_one_work+0x9b5/0x1750 kernel/workqueue.c:2264 > > worker_thread+0x8b/0xd20 kernel/workqueue.c:2410 > > kthread+0x365/0x450 kernel/kthread.c:255 > > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > > > > > Not sure if it's the same or not. Is it addressed by something in flight? > > > > My config: > > https://gist.githubusercontent.com/dvyukov/36c7be311fdec9cd51c649f7c3cb2ddb/raw/39c6f864fdd0ffc53f0822b14c354a73c1695fa1/gistfile1.txt > > > I've tried this fix for pcpu_get_vm_areas: > https://groups.google.com/d/msg/kasan-dev/t_F2X1MWKwk/h152Z3q2AgAJ > and it helps. But this will break syzbot on linux-next soon. Can this be related as well? Crashes on accesses to shadow on the ion memory... BUG: unable to handle page fault for address: fffff52006000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 7ffcd067 P4D 7ffcd067 PUD 2cd10067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 2 PID: 3472 Comm: ion_system_heap Not tainted 5.4.0-next-20191129+ #6 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline] RIP: 0010:check_memory_region+0x83/0x1d0 mm/kasan/generic.c:192 Code: 83 fb 10 0f 8e a9 00 00 00 45 89 c8 41 83 e0 07 75 66 4c 8d 43 07 48 85 db 4c 0f 49 c3 49 c1 f8 03 45 85 c0 0f 84 3f 01 00 00 <48> 83 38 00 75 1c 41 83 e8 01 4e 8d 44 c0 08 48 83 c0 08 49 39 c0 RSP: 0018:ffffc900011c7b10 EFLAGS: 00010206 RAX: fffff52006000000 RBX: 0000000000004000 RCX: ffffffff85988df8 RDX: 0000000000000001 RSI: 0000000000020000 RDI: ffffc90030000000 RBP: ffffc900011c7b28 R08: 0000000000000800 R09: fffff52006000000 R10: fffff52006003fff R11: ffffc9003001ffff R12: fffff52006004000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802d400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52006000000 CR3: 00000000680fb004 CR4: 0000000000760ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: memset+0x23/0x40 mm/kasan/common.c:107 memset include/linux/string.h:410 [inline] ion_heap_clear_pages+0x48/0x70 drivers/staging/android/ion/ion_heap.c:106 ion_heap_sglist_zero+0x1f9/0x260 drivers/staging/android/ion/ion_heap.c:123 ion_heap_buffer_zero+0xf8/0x150 drivers/staging/android/ion/ion_heap.c:145 ion_system_heap_free+0x227/0x290 drivers/staging/android/ion/ion_system_heap.c:163 ion_buffer_destroy+0x15a/0x2d0 drivers/staging/android/ion/ion.c:93 ion_heap_deferred_free+0x267/0x5e0 drivers/staging/android/ion/ion_heap.c:239 kthread+0x365/0x450 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) CR2: fffff52006000000 ---[ end trace c101f19526ce3d42 ]--- RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline] RIP: 0010:check_memory_region+0x83/0x1d0 mm/kasan/generic.c:192 Code: 83 fb 10 0f 8e a9 00 00 00 45 89 c8 41 83 e0 07 75 66 4c 8d 43 07 48 85 db 4c 0f 49 c3 49 c1 f8 03 45 85 c0 0f 84 3f 01 00 00 <48> 83 38 00 75 1c 41 83 e8 01 4e 8d 44 c0 08 48 83 c0 08 49 39 c0 RSP: 0018:ffffc900011c7b10 EFLAGS: 00010206 RAX: fffff52006000000 RBX: 0000000000004000 RCX: ffffffff85988df8 RDX: 0000000000000001 RSI: 0000000000020000 RDI: ffffc90030000000 RBP: ffffc900011c7b28 R08: 0000000000000800 R09: fffff52006000000 R10: fffff52006003fff R11: ffffc9003001ffff R12: fffff52006004000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802d400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52006000000 CR3: 00000000680fb004 CR4: 0000000000760ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554