Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007]
CPU: 0 UID: 0 PID: 5292 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:percpu_ref_get_many+0x8d/0x140
Code: 01 48 c7 c7 00 4b 98 8b be 4b 03 00 00 48 c7 c2 40 4b 98 8b e8 d4 ba 71 ff 49 bc 00 00 00 00 00 fc ff df 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 14 4c f7 ff 49 8b 07 a8 03 75 62
RSP: 0018:ffffc9000291f810 EFLAGS: 00010006
RAX: 000000001fffe000 RBX: ffffffff822bca69 RCX: ef7aa7af70d09d00
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: 0000000000000078 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: dffffc0000000000
R13: ffff88804b03b540 R14: 0000000000000001 R15: 00000000ffff0000
FS:  00007f922c6c8c80(0000) GS:ffff8880b861a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555591000808 CR3: 000000010e45c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 refill_obj_stock+0x254/0x850
 __memcg_slab_free_hook+0x127/0x3d0
 kmem_cache_free+0x223/0x400
 __dequeue_signal+0x487/0x5b0
 dequeue_signal+0x1a2/0x370
 signalfd_read_iter+0x2b7/0x980
 vfs_read+0x55a/0xa30
 ksys_read+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f922c316b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffdad5e3f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f922c316b6a
RDX: 0000000000000080 RSI: 00007ffdad5e40f8 RDI: 0000000000000008
RBP: 000000000000000b R08: 00000000103a41fc R09: 7fffffffffffffff
R10: 3fffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 0000000200000001 R14: 0000000000000001 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:percpu_ref_get_many+0x8d/0x140
Code: 01 48 c7 c7 00 4b 98 8b be 4b 03 00 00 48 c7 c2 40 4b 98 8b e8 d4 ba 71 ff 49 bc 00 00 00 00 00 fc ff df 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 14 4c f7 ff 49 8b 07 a8 03 75 62
RSP: 0018:ffffc9000291f810 EFLAGS: 00010006
RAX: 000000001fffe000 RBX: ffffffff822bca69 RCX: ef7aa7af70d09d00
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: 0000000000000078 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: dffffc0000000000
R13: ffff88804b03b540 R14: 0000000000000001 R15: 00000000ffff0000
FS:  00007f922c6c8c80(0000) GS:ffff8880b861a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555591000808 CR3: 000000010e45c000 CR4: 00000000000006f0
