+Cc RCU On Sun, 24 Nov 2024 at 23:47, syzbot <syzbot+16a19b06125a2963eaee@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 42d9e8b7ccdd Merge tag 'powerpc-6.13-1' of git://git.kerne.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=10a00778580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3d7fd5be0e73b8b > dashboard link: https://syzkaller.appspot.com/bug?extid=16a19b06125a2963eaee > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/ef231513adc7/disk-42d9e8b7.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/54caaac5960b/vmlinux-42d9e8b7.xz > kernel image: https://storage.googleapis.com/syzbot-assets/85b5a6566143/bzImage-42d9e8b7.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+16a19b06125a2963eaee@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > BUG: KCSAN: assert: race in srcu_get_delay kernel/rcu/srcutree.c:658 [inline] > BUG: KCSAN: assert: race in srcu_funnel_gp_start kernel/rcu/srcutree.c:1089 [inline] > BUG: KCSAN: assert: race in srcu_gp_start_if_needed+0x808/0x9f0 kernel/rcu/srcutree.c:1339 > > race at unknown origin, with assert no writes to 0xffffffff8676ffc8 of 8 bytes by task 6285 on cpu 0: > srcu_get_delay kernel/rcu/srcutree.c:658 [inline] > srcu_funnel_gp_start kernel/rcu/srcutree.c:1089 [inline] > srcu_gp_start_if_needed+0x808/0x9f0 kernel/rcu/srcutree.c:1339 > __call_srcu kernel/rcu/srcutree.c:1384 [inline] > __synchronize_srcu+0x114/0x150 kernel/rcu/srcutree.c:1432 > synchronize_srcu+0x1ae/0x1d0 > uprobe_unregister_sync+0x1a/0x20 kernel/events/uprobes.c:1328 > __probe_event_disable kernel/trace/trace_uprobe.c:1138 [inline] > probe_event_disable+0x1f5/0x240 kernel/trace/trace_uprobe.c:1222 > trace_uprobe_register+0xbb/0x3c0 kernel/trace/trace_uprobe.c:1512 > perf_trace_event_unreg+0x6c/0x1a0 kernel/trace/trace_event_perf.c:162 > perf_uprobe_destroy+0x6a/0xf0 kernel/trace/trace_event_perf.c:345 > _free_event+0x7ca/0xa10 kernel/events/core.c:5357 > put_event kernel/events/core.c:5454 [inline] > perf_event_release_kernel+0x61a/0x670 kernel/events/core.c:5579 > perf_release+0x1f/0x30 kernel/events/core.c:5589 > __fput+0x17a/0x6d0 fs/file_table.c:450 > ____fput+0x1c/0x30 fs/file_table.c:478 > task_work_run+0x13a/0x1a0 kernel/task_work.c:239 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] > exit_to_user_mode_loop kernel/entry/common.c:114 [inline] > exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] > __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] > syscall_exit_to_user_mode+0xa8/0x120 kernel/entry/common.c:218 > do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > value changed: 0x0000000000000000 -> 0x0000000000000001 > > Reported by Kernel Concurrency Sanitizer on: > CPU: 0 UID: 0 PID: 6285 Comm: syz.1.1056 Not tainted 6.12.0-syzkaller-08756-g42d9e8b7ccdd #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 > ================================================================== > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion visit https://groups.google.com/d/msgid/syzkaller-bugs/6743acf4.050a0220.1cc393.004d.GAE%40google.com.
