bisecting fixing commit since 32ee7492f104d82b01a44fc4b4ae17d5d2bb237b
building syzkaller on 2274ad39c8bee8efda31dc31ec8933d5624e8fe4
testing commit 32ee7492f104d82b01a44fc4b4ae17d5d2bb237b with gcc (GCC) 8.1.0
kernel signature: b0c4cc9ccd6c245299346098044f606bb53f273926e93a5002962386d7369669
run #0: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #1: crashed: KASAN: use-after-free Read in bpf_prog_kallsyms_find
run #2: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #3: crashed: KASAN: use-after-free Read in bpf_prog_kallsyms_find
run #4: crashed: KASAN: use-after-free Read 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
testing current HEAD a87f96283793d58b042618c689630db264715274
testing commit a87f96283793d58b042618c689630db264715274 with gcc (GCC) 8.1.0
kernel signature: 79b38fcbd70fe4639783b04fe7321180adc78175a7e3682bdb62902dc69001d7
run #0: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #1: crashed: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
run #2: crashed: BUG: unable to handle kernel paging request 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: KASAN: use-after-free Read 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
revisions tested: 2, total time: 25m5.289480274s (build: 16m38.001151512s, test: 7m34.537258022s)
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 ffffc90005aba030
PGD aa49b067 P4D aa49b067 PUD 21bc31067 PMD 21674e067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3698 Comm: systemd-udevd 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: 0018:ffff88808fc9f878 EFLAGS: 00010246
RAX: 1ffff92000b57406 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000013514 RDI: ffffc90005aba002
RBP: ffff88808fc9f8b8 R08: ffffffff8840db80 R09: ffffed1015d44732
R10: ffffed1015d44732 R11: ffff8880aea23993 R12: ffff888084260370
R13: ffffc90005aba000 R14: dffffc0000000000 R15: ffff888084260370
FS:  00007f8883ca48c0(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90005aba030 CR3: 000000008ff00000 CR4: 00000000001406f0
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
 getname_flags+0xb8/0x520 fs/namei.c:140
 user_path_at_empty+0x1e/0x40 fs/namei.c:2609
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xbe/0x150 fs/stat.c:185
 vfs_lstat include/linux/fs.h:3138 [inline]
 __do_sys_newlstat+0x85/0xe0 fs/stat.c:350
 __se_sys_newlstat fs/stat.c:344 [inline]
 __x64_sys_newlstat+0x4f/0x70 fs/stat.c:344
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f8882b17335
Code: 69 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 31 db 2b 00 f7 d8 64 89
RSP: 002b:00007ffcf7aed318 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 0000562a9f16f260 RCX: 00007f8882b17335
RDX: 00007ffcf7aed350 RSI: 00007ffcf7aed350 RDI: 0000562a9f16e260
RBP: 00007ffcf7aed410 R08: 00007f8882dd61d8 R09: 0000000000001010
R10: 00007f8882dd5b58 R11: 0000000000000246 R12: 0000562a9f16e260
R13: 0000562a9f16e27a R14: 0000562a9f1490b5 R15: 0000562a9f1490ba
Modules linked in:
CR2: ffffc90005aba030
---[ end trace fd0cc62a40ecdc37 ]---
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: 0018:ffff88808fc9f878 EFLAGS: 00010246
RAX: 1ffff92000b57406 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000013514 RDI: ffffc90005aba002
RBP: ffff88808fc9f8b8 R08: ffffffff8840db80 R09: ffffed1015d44732
R10: ffffed1015d44732 R11: ffff8880aea23993 R12: ffff888084260370
R13: ffffc90005aba000 R14: dffffc0000000000 R15: ffff888084260370
FS:  00007f8883ca48c0(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90005aba030 CR3: 000000008ff00000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400