Hello, On (08/08/18 11:01), Vlastimil Babka wrote: > On 08/08/2018 05:50 AM, Mikhail Gavrilov wrote: > > Hi guys. > > I am catched new bug. > > Can anyone look? > > fbcon_startup() calls kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL) so > it tells slab it can sleep. The problem must be higher in the stack, > CCing printk people. Cc-ing fbcon/vt people. I'm not sure I know how exactly console takeover is expected to work. printk must be atomic, we can't sleep in console drivers [e.g. printk from IRQs, etc.] > > [226995.988988] BUG: sleeping function called from invalid context at > > mm/slab.h:421 > > [226995.988988] in_atomic(): 1, irqs_disabled(): 1, pid: 22658, name: gsd-rfkill > > [226995.988989] INFO: lockdep is turned off. > > [226995.988989] irq event stamp: 0 > > [226995.988990] hardirqs last enabled at (0): [<0000000000000000>] > > (null) > > [226995.988991] hardirqs last disabled at (0): [<ffffffffa00b6b4a>] > > copy_process.part.32+0x72a/0x1e60 > > [226995.988991] softirqs last enabled at (0): [<ffffffffa00b6b4a>] > > copy_process.part.32+0x72a/0x1e60 > > [226995.988992] softirqs last disabled at (0): [<0000000000000000>] > > (null) > > [226995.988993] CPU: 6 PID: 22658 Comm: gsd-rfkill Tainted: G W > > 4.18.0-0.rc7.git1.1.fc29.x86_64 #1 > > [226995.988993] Hardware name: Gigabyte Technology Co., Ltd. > > Z87M-D3H/Z87M-D3H, BIOS F11 08/12/2014 > > [226995.988994] Call Trace: > > [226995.988994] dump_stack+0x85/0xc0 > > [226995.988995] ___might_sleep.cold.72+0xac/0xbc > > [226995.988995] kmem_cache_alloc_trace+0x202/0x2f0 > > [226995.988996] ? fbcon_startup+0xae/0x300 > > [226995.988996] fbcon_startup+0xae/0x300 > > [226995.988997] do_take_over_console+0x6d/0x180 > > [226995.988997] do_fbcon_takeover+0x58/0xb0 > > [226995.988997] fbcon_output_notifier.cold.35+0x5/0x23 > > [226995.988998] notifier_call_chain+0x39/0x90 > > [226995.988999] vt_console_print+0x363/0x420 > > [226995.988999] console_unlock+0x422/0x610 > > [226995.988999] vprintk_emit+0x268/0x540 > > [226995.989000] printk+0x58/0x6f > > [226995.989000] rfkill_fop_release.cold.16+0xc/0x11 [rfkill] > > [226995.989001] __fput+0xc7/0x250 > > [226995.989001] task_work_run+0xa1/0xd0 > > [226995.989002] exit_to_usermode_loop+0xd8/0xe0 > > [226995.989002] do_syscall_64+0x1df/0x1f0 > > [226995.989003] entry_SYSCALL_64_after_hwframe+0x49/0xbe -ss
