bisecting fixing commit since c3038e718a19fc596f7b1baba0f83d5146dc7784
building syzkaller on 04ca72cd45348daab9d896bbec8ea4c2d13455ac
testing commit c3038e718a19fc596f7b1baba0f83d5146dc7784 with gcc (GCC) 8.1.0
kernel signature: f26fe65ff89cc0f59367747fdcb6ea38072abeeb3366761651d737345903c5a0
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: WARNING 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: WARNING in bpf_prog_kallsyms_find
testing current HEAD 2d16cf4817bc6944a2adb5bf4db607c8258e87da
testing commit 2d16cf4817bc6944a2adb5bf4db607c8258e87da with gcc (GCC) 8.1.0
kernel signature: d1e39158d9f477fc46af58b8763fb35e3e28fc05a01c2e80078bb028867fbb75
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: BUG: unable to handle kernel paging request 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: 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: 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: 26m30.735304443s (build: 17m16.122725635s, test: 8m22.990671385s)
the crash still happens on HEAD
commit msg: Linux 4.19.125
crash: BUG: unable to handle kernel paging request in bpf_prog_kallsyms_find
BUG: unable to handle kernel paging request at ffffc90001a76002
PGD 12c2f0067 P4D 12c2f0067 PUD 21bc31067 PMD a1054067 PTE 80000000953fe163
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 30323 Comm: syz-executor.5 Not tainted 4.19.125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bpf_prog_ebpf_jited include/linux/filter.h:884 [inline]
RIP: 0010:bpf_get_prog_addr_region kernel/bpf/core.c:383 [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+0xee/0x2e0 kernel/bpf/core.c:511
Code: 8b 5d 30 48 89 f8 49 89 f9 48 c1 e8 03 41 83 e1 07 42 0f b6 04 30 48 81 e3 00 f0 ff ff 44 38 c8 7f 08 84 c0 0f 85 fa 00 00 00 <41> f6 45 02 01 75 02 0f 0b 48 39 da 0f 82 92 00 00 00 48 89 d8 48
RSP: 0018:ffff888072a9f990 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffffa00c8000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000028ec4 RDI: ffffc90001a76002
RBP: ffff888072a9f9d0 R08: ffffffff87e0dbc0 R09: 0000000000000002
R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: ffff8880914c6bb0
R13: ffffc90001a76000 R14: dffffc0000000000 R15: ffff8880914c6bb0
FS:  000000000183d940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90001a76002 CR3: 00000000a95da000 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
 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]
 ksys_chdir+0x8e/0x180 fs/open.c:458
 __do_sys_chdir fs/open.c:480 [inline]
 __se_sys_chdir fs/open.c:478 [inline]
 __x64_sys_chdir+0x2c/0x40 fs/open.c:478
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459527
Code: 44 00 00 b8 21 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad c0 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 50 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8d c0 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc6b745db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000459527
RDX: 0000000000000001 RSI: 0000000000715e90 RDI: 00007ffc6b745e00
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000183d940
R10: 000000000183dc10 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc6b745df0 R14: 0000000000000000 R15: 00007ffc6b745e00
Modules linked in:
CR2: ffffc90001a76002
---[ end trace 8214ffb330e72885 ]---
RIP: 0010:bpf_prog_ebpf_jited include/linux/filter.h:884 [inline]
RIP: 0010:bpf_get_prog_addr_region kernel/bpf/core.c:383 [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+0xee/0x2e0 kernel/bpf/core.c:511
Code: 8b 5d 30 48 89 f8 49 89 f9 48 c1 e8 03 41 83 e1 07 42 0f b6 04 30 48 81 e3 00 f0 ff ff 44 38 c8 7f 08 84 c0 0f 85 fa 00 00 00 <41> f6 45 02 01 75 02 0f 0b 48 39 da 0f 82 92 00 00 00 48 89 d8 48
RSP: 0018:ffff888072a9f990 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffffa00c8000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000028ec4 RDI: ffffc90001a76002
RBP: ffff888072a9f9d0 R08: ffffffff87e0dbc0 R09: 0000000000000002
R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: ffff8880914c6bb0
R13: ffffc90001a76000 R14: dffffc0000000000 R15: ffff8880914c6bb0
FS:  000000000183d940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90001a76002 CR3: 00000000a95da000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400