syzbot


BUG: scheduling while atomic in bpf_dispatcher_change_prog

Status: upstream: reported C repro on 2024/03/14 04:00
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+61fde469491b889594e3@syzkaller.appspotmail.com
First crash: 96d, last: 96d
Bug presence (2)
Date Name Commit Repro Result
2024/03/14 lts (merge base) 883d1a956208 C [report] BUG: scheduling while atomic in exit_to_user_mode_loop
2024/04/11 upstream (ToT) e8c39d0f57f3 C Didn't crash
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/06/06 04:59 8m retest repro android14-6.1 report log
2024/03/28 03:59 52m retest repro android14-6.1 report log

Sample crash report:
BUG: scheduling while atomic: syz-executor210/319/0x00000002
Modules linked in:
Preemption disabled at:
[<ffffffff818eaf88>] try_get_fmt_tmp_buf kernel/bpf/helpers.c:768 [inline]
[<ffffffff818eaf88>] bpf_bprintf_prepare+0x118/0x1360 kernel/bpf/helpers.c:818
CPU: 1 PID: 319 Comm: syz-executor210 Not tainted 6.1.68-syzkaller-00058-g4c25eb8ea5a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 dump_stack+0x15/0x1b lib/dump_stack.c:113
 __schedule_bug+0x195/0x260 kernel/sched/core.c:5960
 schedule_debug kernel/sched/core.c:5987 [inline]
 __schedule+0xcf7/0x1550 kernel/sched/core.c:6622
 schedule+0xc3/0x180 kernel/sched/core.c:6805
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6864
 mutex_optimistic_spin kernel/locking/mutex.c:529 [inline]
 __mutex_lock_common kernel/locking/mutex.c:629 [inline]
 __mutex_lock+0x5b6/0x1ca0 kernel/locking/mutex.c:774
 __mutex_lock_slowpath+0xe/0x10 kernel/locking/mutex.c:1063
 mutex_lock+0x130/0x1e0 kernel/locking/mutex.c:295
 bpf_dispatcher_change_prog+0xa0/0xf20 kernel/bpf/dispatcher.c:141
 bpf_prog_change_xdp+0x24/0x30 net/core/filter.c:11462
 bpf_prog_test_run_xdp+0x97a/0x1130 net/bpf/test_run.c:1407
 bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3635
 __sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:4990
 __do_sys_bpf kernel/bpf/syscall.c:5076 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5074 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5074
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8d909b6fe9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffecaf17c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8d909b6fe9
RDX: 0000000000000050 RSI: 0000000020000640 RDI: 000000000000000a
RBP: 0000000000000000 R08: 00000000000000a0 R09: 00000000000000a0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/14 03:58 android14-6.1 4c25eb8ea5a2 f919f202 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1-perf BUG: scheduling while atomic in bpf_dispatcher_change_prog
* Struck through repros no longer work on HEAD.