syzbot


BUG: using __this_cpu_add() in preemptible code in validate_chain

Status: upstream: reported on 2024/04/07 20:00
Reported-by: syzbot+0a9a5f829da991395ca5@syzkaller.appspotmail.com
First crash: 78d, last: 78d

Sample crash report:
BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor.2/4224
caller is __pv_queued_spin_lock_slowpath+0x941/0xc50 kernel/locking/qspinlock.c:565
CPU: 1 PID: 4224 Comm: syz-executor.2 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 check_preemption_disabled+0x107/0x110 lib/smp_processor_id.c:49
 __pv_queued_spin_lock_slowpath+0x941/0xc50 kernel/locking/qspinlock.c:565
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x42/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 lockdep_lock+0x1a7/0x2a0 kernel/locking/lockdep.c:144
 graph_lock kernel/locking/lockdep.c:170 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3760 [inline]
 validate_chain+0x1d0/0x5950 kernel/locking/lockdep.c:3793
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __might_fault+0xbd/0x110 mm/memory.c:5831
 _copy_from_iter+0xfa/0xff0 lib/iov_iter.c:630
 copy_from_iter include/linux/uio.h:187 [inline]
 kernfs_fop_write_iter+0x1a6/0x4f0 fs/kernfs/file.c:311
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x7ae/0xba0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 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: 0033:0x7f21e267de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f21e335e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f21e27abf80 RCX: 00007f21e267de69
RDX: 0000000000000012 RSI: 0000000020000380 RDI: 0000000000000007
RBP: 00007f21e26ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f21e27abf80 R15: 00007ffe9c965678
 </TASK>
------------[ cut here ]------------

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/07 19:59 linux-6.1.y 347385861c50 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: using __this_cpu_add() in preemptible code in validate_chain
* Struck through repros no longer work on HEAD.