bisecting fixing commit since c3038e718a19fc596f7b1baba0f83d5146dc7784
building syzkaller on 04ca72cd45348daab9d896bbec8ea4c2d13455ac
testing commit c3038e718a19fc596f7b1baba0f83d5146dc7784 with gcc (GCC) 8.1.0
kernel signature: 9b14efbc989326d4c978660c12b1418cbaa583826b541e49954ea9d35d537f84
run #0: crashed: KASAN: use-after-free Read in bpf_prog_kallsyms_find
run #1: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #2: crashed: WARNING in bpf_prog_kallsyms_find
run #3: crashed: KASAN: use-after-free Read in bpf_prog_kallsyms_find
run #4: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #5: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #6: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #7: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #8: crashed: KASAN: use-after-free Read in bpf_prog_kallsyms_find
run #9: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
testing current HEAD a87f96283793d58b042618c689630db264715274
testing commit a87f96283793d58b042618c689630db264715274 with gcc (GCC) 8.1.0
kernel signature: a4ff6f9ae172193c204886695f69417fba0b9a228e1741b225ef3f0932e08677
run #0: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #1: crashed: WARNING in bpf_prog_kallsyms_find
run #2: crashed: WARNING in bpf_prog_kallsyms_find
run #3: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #4: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #5: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #6: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #7: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #8: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #9: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
revisions tested: 2, total time: 23m12.883263284s (build: 15m37.704764815s, test: 6m52.692463763s)
the crash still happens on HEAD
commit msg: Linux 4.19.145
crash: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
BUG: unable to handle kernel paging request at ffffc90005a7d030
PGD aa430067 P4D aa430067 PUD 21bc31067 PMD 2165b0067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 18925 Comm: syz-executor.0 Not tainted 4.19.145-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bpf_jit_binary_hdr include/linux/filter.h:699 [inline]
RIP: 0010:bpf_get_prog_addr_region kernel/bpf/core.c:380 [inline]
RIP: 0010:bpf_tree_comp kernel/bpf/core.c:437 [inline]
RIP: 0010:__lt_find include/linux/rbtree_latch.h:115 [inline]
RIP: 0010:latch_tree_find include/linux/rbtree_latch.h:208 [inline]
RIP: 0010:bpf_prog_kallsyms_find+0xc3/0x2e0 kernel/bpf/core.c:511
Code: 03 42 80 3c 30 00 0f 85 1c 01 00 00 4d 8b 6f 50 49 8d 7d 30 48 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 50 01 00 00 49 8d 7d 02 <49> 8b 5d 30 48 89 f8 49 89 f9 48 c1 e8 03 41 83 e1 07 42 0f b6 04
RSP: 0000:ffff8880a596f720 EFLAGS: 00010246
RAX: 1ffff92000b4fa06 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000014bf4 RDI: ffffc90005a7d002
RBP: ffff8880a596f760 R08: ffffffff8800db80 R09: ffffed1015d64732
R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: ffff8880a96bb830
R13: ffffc90005a7d000 R14: dffffc0000000000 R15: ffff8880a96bb830
FS:  00000000010e8940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90005a7d030 CR3: 0000000097560000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 is_bpf_text_address+0x48/0xe0 kernel/bpf/core.c:546
 kernel_text_address+0x79/0xf0 kernel/extable.c:152
 __kernel_text_address+0xd/0x40 kernel/extable.c:107
 unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:18
 __save_stack_trace+0x9c/0x100 arch/x86/kernel/stacktrace.c:45
 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc mm/slab.c:3397 [inline]
 kmem_cache_alloc+0x11b/0x730 mm/slab.c:3557
 anon_vma_chain_alloc mm/rmap.c:129 [inline]
 __anon_vma_prepare+0x58/0x350 mm/rmap.c:183
 anon_vma_prepare include/linux/rmap.h:153 [inline]
 do_huge_pmd_anonymous_page+0xbe6/0x1410 mm/huge_memory.c:688
 create_huge_pmd mm/memory.c:3932 [inline]
 __handle_mm_fault+0x2117/0x3230 mm/memory.c:4136
 handle_mm_fault+0x36b/0x8d0 mm/memory.c:4202
 __do_page_fault+0x466/0xb20 arch/x86/mm/fault.c:1412
 do_page_fault+0x64/0x3a7 arch/x86/mm/fault.c:1487
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205
RIP: 0033:0x400644
Code: 06 e9 49 01 00 00 48 8b 44 24 10 48 0b 44 24 28 75 1f 48 8b 14 24 48 8b 7c 24 20 be 04 00 00 00 e8 11 5a 00 00 48 8b 74 24 08 <89> 06 e9 1e 01 00 00 48 8b 44 24 08 48 8b 14 24 be 04 00 00 00 8b
RSP: 002b:00007ffdc5b27ac0 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000000000003
RBP: 0000000000760000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdc5b27ce0 R14: 0000000000760008 R15: 00007ffdc5b27cf0
Modules linked in:
CR2: ffffc90005a7d030
---[ end trace ab55506a3e711cc2 ]---
RIP: 0010:bpf_jit_binary_hdr include/linux/filter.h:699 [inline]
RIP: 0010:bpf_get_prog_addr_region kernel/bpf/core.c:380 [inline]
RIP: 0010:bpf_tree_comp kernel/bpf/core.c:437 [inline]
RIP: 0010:__lt_find include/linux/rbtree_latch.h:115 [inline]
RIP: 0010:latch_tree_find include/linux/rbtree_latch.h:208 [inline]
RIP: 0010:bpf_prog_kallsyms_find+0xc3/0x2e0 kernel/bpf/core.c:511
Code: 03 42 80 3c 30 00 0f 85 1c 01 00 00 4d 8b 6f 50 49 8d 7d 30 48 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 50 01 00 00 49 8d 7d 02 <49> 8b 5d 30 48 89 f8 49 89 f9 48 c1 e8 03 41 83 e1 07 42 0f b6 04
RSP: 0000:ffff8880a596f720 EFLAGS: 00010246
RAX: 1ffff92000b4fa06 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000014bf4 RDI: ffffc90005a7d002
RBP: ffff8880a596f760 R08: ffffffff8800db80 R09: ffffed1015d64732
R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: ffff8880a96bb830
R13: ffffc90005a7d000 R14: dffffc0000000000 R15: ffff8880a96bb830
FS:  00000000010e8940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90005a7d030 CR3: 0000000097560000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400