BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 11e488067 P4D 11e488067 PUD 122460067 PMD 0 Oops: 0002 [#1] PREEMPT SMP CPU: 0 PID: 8856 Comm: syz-executor.1 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:66 Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 RSP: 0018:ffffc9000363b9f8 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000008 RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88811f679800 R08: 0000000000000000 R09: 0000000000000000 R10: 000088811f6798c8 R11: 000088811f6798cb R12: ffff88811f679a70 R13: ffff88811f679aa4 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fa242de9700(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000122717000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memset include/linux/string.h:366 [inline] choke_reset+0x166/0x1e0 net/sched/sch_choke.c:326 qdisc_reset+0x59/0x300 net/sched/sch_generic.c:910 dev_deactivate_queue.constprop.0+0xdf/0x150 net/sched/sch_generic.c:1138 netdev_for_each_tx_queue include/linux/netdevice.h:2197 [inline] dev_deactivate_many+0xab/0x5b0 net/sched/sch_generic.c:1195 __dev_close_many+0xbf/0x1e0 net/core/dev.c:1507 __dev_close net/core/dev.c:1532 [inline] __dev_change_flags+0x199/0x4b0 net/core/dev.c:8141 dev_change_flags+0x62/0xd0 net/core/dev.c:8214 devinet_ioctl+0xc1c/0xf40 net/ipv4/devinet.c:1137 inet_ioctl+0x12b/0x240 net/ipv4/af_inet.c:957 sock_do_ioctl+0x61/0x230 net/socket.c:1053 sock_ioctl+0x3a2/0x5e0 net/socket.c:1204 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x101/0x150 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca59 Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa242de8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004f4820 RCX: 000000000045ca59 RDX: 0000000020000040 RSI: 0000000000008914 RDI: 0000000000000004 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006d7 R14: 00000000004c9bba R15: 00007fa242de96d4 Modules linked in: CR2: 0000000000000000 ---[ end trace 6ba504a18bbec236 ]--- RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:66 Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 RSP: 0018:ffffc9000363b9f8 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000008 RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88811f679800 R08: 0000000000000000 R09: 0000000000000000 R10: 000088811f6798c8 R11: 000088811f6798cb R12: ffff88811f679a70 R13: ffff88811f679aa4 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fa242de9700(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000122717000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400