On Fri, Jul 21, 2023 at 11:30 AM syzbot <syzbot+c2b68bdf76e442836443@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > syzbot has bisected this issue to: > > commit a0b0fd53e1e67639b303b15939b9c653dbe7a8c4 > Author: Bart Van Assche <bvanassche@xxxxxxx> > Date: Thu Feb 14 23:00:46 2019 +0000 > > locking/lockdep: Free lock classes that are no longer in use No, that doesn't seem like a real cause commit. > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16c0c84ea80000 The reproducer actually causes a lot of different crashes, which apparently confused the bisector. run #0: crashed: general protection fault in ext4_finish_bio run #1: crashed: general protection fault in ext4_finish_bio run #2: crashed: KASAN: wild-memory-access Read in force_sig_info_to_task run #3: crashed: KASAN: wild-memory-access Read in force_sig_info_to_task run #4: crashed: BUG: unable to handle kernel paging request in __run_timers run #5: crashed: BUG: unable to handle kernel paging request in __run_timers run #6: crashed: general protection fault in mac80211_hwsim_netlink_notify run #7: crashed: general protection fault in mac80211_hwsim_netlink_notify run #8: crashed: general protection fault in __run_timers run #9: crashed: general protection fault in __run_timers run #10: crashed: KASAN: wild-memory-access Read in process_one_work run #11: crashed: KASAN: wild-memory-access Read in process_one_work run #12: crashed: general protection fault in timerqueue_del run #13: crashed: general protection fault in timerqueue_del run #14: crashed: kernel BUG in corrupted run #15: crashed: kernel BUG in corrupted run #16: crashed: general protection fault in mm_update_next_owner run #17: crashed: general protection fault in mm_update_next_owner Isn't it a sign of a severe memory corruption caused by the reproducer? > start commit: bfa3037d8280 Merge tag 'fuse-update-6.5' of git://git.kern.. > git tree: upstream > final oops: https://syzkaller.appspot.com/x/report.txt?x=15c0c84ea80000 > console output: https://syzkaller.appspot.com/x/log.txt?x=11c0c84ea80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=27e33fd2346a54b > dashboard link: https://syzkaller.appspot.com/bug?extid=c2b68bdf76e442836443 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111c904ea80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116b0faaa80000 > > Reported-by: syzbot+c2b68bdf76e442836443@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: a0b0fd53e1e6 ("locking/lockdep: Free lock classes that are no longer in use") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection >
