BUG: unable to handle page fault for address: 0000000000004004
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 8813c067 P4D 8813c067 PUD 8813d067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10277 Comm: syz-executor.4 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:preempt_schedule_notrace_thunk+0x18/0x31 arch/x86/entry/thunk_64.S:48
Code: 52 51 50 41 50 41 51 41 52 41 53 e8 a3 d5 f5 06 eb 18 55 48 89 e5 57 77 00 77 00 00 00 70 07 77 70 07 00 00 00 00 00 00 70 07 <00> 00 70 07 00 77 00 70 07 00 00 00 00 00 00 00 00 00 77 07 00 cc
RSP: 0018:ffffc90008d66d90 EFLAGS: 00010246
RAX: 0000000000004004 RBX: 1ffff920011acdc5 RCX: ffffffff87f64b99
RDX: ffffed10134f3869 RSI: 0000000000000008 RDI: ffff88809a79c340
RBP: ffffc90008d66dd8 R08: 0000000000000000 R09: ffff88809a79c347
R10: ffffed10134f3868 R11: 0000000000000000 R12: ffffc90008d60000
R13: ffffc90008d66ef5 R14: ffffc90008d66f10 R15: ffffc90008d66ec0
FS:  00007fbe741e0700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000004004 CR3: 000000004a481000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 unwind_next_frame+0xe54/0x1f90 arch/x86/kernel/unwind_orc.c:614
 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x550 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1094 [inline]
 alloc_skb_with_frags+0x92/0x570 net/core/skbuff.c:5771
 sock_alloc_send_pskb+0x72a/0x880 net/core/sock.c:2348
 __ip_append_data+0x1595/0x31c0 net/ipv4/ip_output.c:1095
 ip_make_skb+0x226/0x2a0 net/ipv4/ip_output.c:1632
 udp_sendmsg+0x1c2d/0x26c0 net/ipv4/udp.c:1230
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:671
 ____sys_sendmsg+0x331/0x810 net/socket.c:2353
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407
 __sys_sendmmsg+0x195/0x480 net/socket.c:2497
 __do_sys_sendmmsg net/socket.c:2526 [inline]
 __se_sys_sendmmsg net/socket.c:2523 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2523
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbe741dfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00000000000279c0 RCX: 000000000045d5b9
RDX: 000000000800001d RSI: 0000000020007fc0 RDI: 0000000000000004
RBP: 000000000118cf88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 000000000169fb6f R14: 00007fbe741e09c0 R15: 000000000118cf4c
Modules linked in:
CR2: 0000000000004004