BUG: sleeping function called from invalid context in console

BUG: sleeping function called from invalid context in console_lock (2)
Status: upstream: reported C repro on 2021/06/07 15:46
Reported-by: syzbot+dbac96d8e73b61aa559c@syzkaller.appspotmail.com
First crash: 233d, last: 49d

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: BUG: sleeping function called from invalid context in do_con_write (log)
Repro: C syz .config

Fix bisection: the fix commit could be any of (bisect log):
614124bea77e Linux 5.13-rc5
f55966571d5e Merge tag 'drm-next-2021-07-08-1' of git://anongit.freedesktop.org/drm/drm

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	BUG: sleeping function called from invalid context in console_lock				1	617d	617d	0/22	auto-closed as invalid on 2020/09/14 09:18

Sample crash report:

BUG: sleeping function called from invalid context at kernel/printk/printk.c:2521
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 6521, name: syz-executor083
3 locks held by syz-executor083/6521:
 #0: ffff88801cb28098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252
 #1: ffff88801cb28468 (&tty->flow.lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:388 [inline]
 #1: ffff88801cb28468 (&tty->flow.lock){....}-{2:2}, at: n_tty_ioctl_helper+0xc1/0x2d0 drivers/tty/tty_ioctl.c:881
 #2: ffff88801cb28098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1d/0x80 drivers/tty/tty_ldisc.c:273
irq event stamp: 894
hardirqs last  enabled at (893): [<ffffffff81be5125>] kasan_quarantine_put+0xf5/0x210 mm/kasan/quarantine.c:220
hardirqs last disabled at (894): [<ffffffff89395b71>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline]
hardirqs last disabled at (894): [<ffffffff89395b71>] _raw_spin_lock_irq+0x41/0x50 kernel/locking/spinlock.c:170
softirqs last  enabled at (0): [<ffffffff8144346c>] copy_process+0x1e8c/0x7590 kernel/fork.c:2139
softirqs last disabled at (0): [<0000000000000000>] 0x0
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 6521 Comm: syz-executor083 Not tainted 5.15.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 ___might_sleep.cold+0x1f3/0x239 kernel/sched/core.c:9539
 console_lock+0x19/0x80 kernel/printk/printk.c:2521
 do_con_write+0x10f/0x1e40 drivers/tty/vt/vt.c:2908
 con_write+0x21/0x40 drivers/tty/vt/vt.c:3295
 n_hdlc_send_frames+0x24b/0x490 drivers/tty/n_hdlc.c:290
 tty_wakeup+0xe1/0x120 drivers/tty/tty_io.c:534
 __start_tty drivers/tty/tty_io.c:806 [inline]
 __start_tty+0xfb/0x130 drivers/tty/tty_io.c:799
 n_tty_ioctl_helper+0x2a3/0x2d0 drivers/tty/tty_ioctl.c:884
 n_hdlc_tty_ioctl+0xe4/0x360 drivers/tty/n_hdlc.c:633
 tty_ioctl+0xc69/0x1670 drivers/tty/tty_io.c:2814
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fa09e007199
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffed48eff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007fa09e007199
RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005
RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000e3f9
R13: 00007fffed48f00c R14: 00007fffed48f020 R15: 00007fffed48f010

Crashes (19):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-root	2021/10/30 12:02	upstream	f25a5481af12	098b5d53	.config	log	report	syz	C		BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce	2021/08/05 23:20	upstream	902e7f373fff	d2d6e680	.config	log	report	syz	C		BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce	2021/06/07 23:16	upstream	614124bea77e	e59537be	.config	log	report	syz	C		BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce	2021/06/06 00:29	upstream	e5220dd16778	500c2339	.config	log	report	syz	C		BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce-root	2021/12/07 02:39	upstream	f80ef9e49fdf	0230ba3e	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-qemu-upstream	2021/12/05 19:07	upstream	79a72162048e	a617004c	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce-selinux-root	2021/12/03 22:56	upstream	5f58da2befa5	c7c20675	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce-smack-root	2021/12/01 01:19	upstream	f080815fdb3e	80270552	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce-selinux-root	2021/11/30 16:17	upstream	d58071a8a76d	80270552	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce-selinux-root	2021/11/30 14:52	upstream	d58071a8a76d	80270552	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce-root	2021/11/28 05:07	upstream	741392771338	63eeac02	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce-selinux-root	2021/09/27 03:25	upstream	996148ee05d0	78494d16	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce-smack-root	2021/09/20 21:50	upstream	e4e737bb5c17	af796c18	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-kasan-gce	2021/06/06 00:10	upstream	e5220dd16778	500c2339	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-qemu-upstream-386	2021/12/05 23:46	upstream	944207047ca4	a617004c	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-linux-next-kasan-gce-root	2021/12/02 10:58	linux-next	f81e94e91878	61f86278	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-linux-next-kasan-gce-root	2021/11/22 05:03	linux-next	5191249f8803	4eb20a4e	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-linux-next-kasan-gce-root	2021/11/17 14:01	linux-next	fd96a4057bd0	cafff8b6	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock
ci-upstream-linux-next-kasan-gce-root	2021/10/03 07:07	linux-next	a25006a77348	db0f5787	.config	log	report			info	BUG: sleeping function called from invalid context in console_lock