BUG: using smp_processor_id() in preemptible code in __do_user

BUG: using smp_processor_id() in preemptible code in __do_user_fault
Status: upstream: reported on 2021/03/11 08:17
Reported-by: syzbot+a7ee43e564223f195c84@syzkaller.appspotmail.com
First crash: 262d, last: 39m

Sample crash report:

BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/21004
caller is debug_smp_processor_id+0x20/0x24 lib/smp_processor_id.c:60
CPU: 0 PID: 21004 Comm: syz-executor.0 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<816b8468>] (dump_backtrace) from [<816b8654>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237)
 r7:00000000 r6:816d3974 r5:60000113 r4:81d605b8
[<816b863c>] (show_stack) from [<816c10f0>] (__dump_stack lib/dump_stack.c:88 [inline])
[<816b863c>] (show_stack) from [<816c10f0>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<816c10a8>] (dump_stack_lvl) from [<816c1114>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:81d69e40 r4:83f0a280
[<816c10fc>] (dump_stack) from [<816d3950>] (check_preemption_disabled+0xfc/0x100 lib/smp_processor_id.c:49)
[<816d3854>] (check_preemption_disabled) from [<816d3974>] (debug_smp_processor_id+0x20/0x24 lib/smp_processor_id.c:60)
 r7:00000207 r6:83f0a280 r5:0000000b r4:ffffffff
[<816d3954>] (debug_smp_processor_id) from [<8021656c>] (harden_branch_predictor arch/arm/include/asm/system_misc.h:23 [inline])
[<816d3954>] (debug_smp_processor_id) from [<8021656c>] (__do_user_fault+0x8c/0xfc arch/arm/mm/fault.c:153)
[<802164e0>] (__do_user_fault) from [<802167e4>] (do_page_fault+0x18c/0x38c arch/arm/mm/fault.c:364)
 r9:843b6840 r8:843b6800 r7:83f0a280 r6:00000207 r5:ffffffff r4:8582bfb0
[<80216658>] (do_page_fault) from [<80216bcc>] (do_DataAbort+0x38/0xa8 arch/arm/mm/fault.c:529)
 r10:00000001 r9:00000000 r8:80216658 r7:8582bfb0 r6:ffffffff r5:00000207
 r4:8221ce58
[<80216b94>] (do_DataAbort) from [<80200d5c>] (__dabt_usr+0x5c/0x60 arch/arm/kernel/entry-armv.S:420)
Exception stack(0x8582bfb0 to 0x8582bff8)
bfa0:                                     ffffffff ffffffff ffffffff 00050010
bfc0: 76fa204c 76fa2010 ffffffff 00000003 7e9b531a 00000000 00000001 76fa320c
bfe0: 00000000 76fa1fd8 00018fc4 0004686c 20000010 ffffffff
 r8:5bd2d000 r7:83f0a280 r6:ffffffff r5:20000010 r4:0004686c

Crashes (12184):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-qemu2-arm32	2021/11/27 21:56	upstream	741392771338	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 19:59	upstream	741392771338	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 18:27	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 17:22	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 16:18	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 15:01	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 14:19	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 13:12	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 12:07	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 11:17	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 10:14	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 09:32	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 08:30	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 08:19	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 07:05	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 06:01	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 04:39	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 01:26	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/27 00:18	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 23:36	upstream	c5c17547b778	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 21:13	upstream	a4849f6000e2	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 19:58	upstream	a4849f6000e2	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 18:42	upstream	a4849f6000e2	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 17:40	upstream	a4849f6000e2	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 17:07	upstream	a4849f6000e2	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 15:25	upstream	a4849f6000e2	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 13:29	upstream	a4849f6000e2	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 09:39	upstream	a4849f6000e2	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 07:20	upstream	b501b85957de	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 07:03	upstream	b501b85957de	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 05:54	upstream	b501b85957de	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 04:52	upstream	b501b85957de	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 03:00	upstream	b501b85957de	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 02:45	upstream	b501b85957de	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/26 01:37	upstream	b501b85957de	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/25 19:54	upstream	b501b85957de	63eeac02	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/25 17:20	upstream	5f53fa508db0	545ab074	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/25 16:20	upstream	5f53fa508db0	545ab074	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/25 15:19	upstream	5f53fa508db0	545ab074	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/25 14:26	upstream	5f53fa508db0	545ab074	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/25 12:54	upstream	5f53fa508db0	545ab074	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/25 11:18	upstream	5f53fa508db0	545ab074	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/11/25 11:05	upstream	5f53fa508db0	545ab074	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/03/11 08:04	upstream	a74e6a014c9d	c2ca1f2a	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault
ci-qemu2-arm32	2021/03/10 02:11	upstream	05a59d79793d	26967e35	.config	log	report	info	BUG: using smp_processor_id() in preemptible code in __do_user_fault