Andreas Schwab <schwab@xxxxxxxxxxxxxx> writes: > This breaks booting on ppc32: Does enabling CONFIG_DEBUG_ATOMIC_SLEEP fix the crash? It did for me on qemu. cheers > Kernel attemptd to writ user page (1ff0) - exploit attempt? (uid: 0) > BUG: Unable to handle kernel data access on write at 0x00001ff0 > Faulting instruction address: 0xc0009554 > Vector: 300 (Data Access) at [c0b09d10] > pc: c0009554: do_softirq_own_stack+0x18/0x30 > lr: c004f480: __irq_exit_rcu+0x70/0xc0 > sp: c0b09dd0 > msr: 1032 > dar: 1ff0 > dsisr: 42000000 > current = 0xc0a08360 > pid = 0, comm = swapper > Linux version 6.5.0 ... > enter ? for help > [c0b09de0] c00ff480 __irq_exit_rcu+0x70/0xc0 > [c0b09df0] c0005a98 Decrementer_virt+0x108/0x10c > --- Exception: 900 (Decrementer) at c06cfa0c __schedule+0x4fc/0x510 > [c0b09ec0] c06cf75c __schedule+0x1cc/0x510 (unreliable) > [c0b09ef0] c06cfc90 __cond_resched+0x2c/0x54 > [c0b09f00] c06d07f8 mutex_lock_killable+0x18/0x5c > [c0b09f10] c013c404 pcpu_alloc+0x110/0x4dc > [c0b09f70] c000cc34 alloc_descr.isra.18+0x48/0x144 > [c0b09f90] c0988aa0 early_irq_init+0x64/0x8c > [c0b09fa0] c097a5a4 start_kernel+0x5b4/0x7b0 > [c0b09ff0] 00003dc0 > mon> > > -- > Andreas Schwab, schwab@xxxxxxxxxxxxxx > GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 > "And now for something completely different."
