bisecting fixing commit since cd02217a5d813e2bbec984a9eeb8280ff290a150 building syzkaller on 6436ce4bcd8e2c7dcca0b171ac91f51e96d973f8 testing commit cd02217a5d813e2bbec984a9eeb8280ff290a150 compiler: gcc (GCC) 8.4.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 7429664908cbaf889cc71c2f6854814bbc32e8a39cc72da43e7c8a2469bf63f8 all runs: crashed: WARNING in rtnl_delete_link testing current HEAD 83e396641110663d3c7bb25b9bc0c6a750359ecf testing commit 83e396641110663d3c7bb25b9bc0c6a750359ecf compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 8cf19a4e4f423e7ab5e99961a724ac49c776d6278069b834b3fb4aa9099b4ad2 all runs: OK # git bisect start 83e396641110663d3c7bb25b9bc0c6a750359ecf cd02217a5d813e2bbec984a9eeb8280ff290a150 Bisecting: 62124 revisions left to test after this (roughly 16 steps) [6bab076a3d2ff4298483c1a3b77162811b451863] Merge tag 'dlm-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm testing commit 6bab076a3d2ff4298483c1a3b77162811b451863 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: b29c1df5caa6b1181416173aa8bb1f5de109294e588902ba95bbf80553f73741 all runs: crashed: WARNING in rtnl_dellink # git bisect good 6bab076a3d2ff4298483c1a3b77162811b451863 Bisecting: 31076 revisions left to test after this (roughly 15 steps) [70868a180501d17fea58153c649d56bc18435315] Merge tag 'cxl-for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl testing commit 70868a180501d17fea58153c649d56bc18435315 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: d9b2ced9a1938bb83fd19a8e1a356a81faa291bcbbda2ceb9a69b38238e708b1 run #0: crashed: WARNING in rtnl_dellink run #1: crashed: WARNING in rtnl_dellink run #2: crashed: WARNING in rtnl_dellink run #3: crashed: WARNING in rtnl_dellink run #4: crashed: KASAN: use-after-free Read in __d_alloc run #5: crashed: WARNING in rtnl_dellink run #6: crashed: WARNING in rtnl_dellink run #7: crashed: WARNING in rtnl_dellink run #8: crashed: WARNING in rtnl_dellink run #9: crashed: WARNING in rtnl_dellink # git bisect good 70868a180501d17fea58153c649d56bc18435315 Bisecting: 15515 revisions left to test after this (roughly 14 steps) [6cbcc7ab2147d721700029a78558dc0ea4207153] Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi testing commit 6cbcc7ab2147d721700029a78558dc0ea4207153 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 7ba64b3bafdf991143a22fa2fbd5adffcc286a9762d43e62720ad521311eb9f4 all runs: crashed: WARNING in rtnl_dellink # git bisect good 6cbcc7ab2147d721700029a78558dc0ea4207153 Bisecting: 7763 revisions left to test after this (roughly 13 steps) [e3daa2607b1f4bb1d09a5a8ad89ad9f7327a2e63] Merge branch 'acpi-pfrut' testing commit e3daa2607b1f4bb1d09a5a8ad89ad9f7327a2e63 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 725ba80721535903129a3c0a2902f73cfcb8ca367cf127ff9473d6f942cea894 all runs: OK # git bisect bad e3daa2607b1f4bb1d09a5a8ad89ad9f7327a2e63 Bisecting: 3899 revisions left to test after this (roughly 12 steps) [49dc9013e34b205bae9d7a5f365a3da33c508c9d] net/smc: Use the bitmap API when applicable testing commit 49dc9013e34b205bae9d7a5f365a3da33c508c9d compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 0337f35530c679c2897759de8e5c1507a4c97db42c59ce651f4e90a4707ede97 all runs: OK # git bisect bad 49dc9013e34b205bae9d7a5f365a3da33c508c9d Bisecting: 1922 revisions left to test after this (roughly 11 steps) [d9c1e6409cf47585a1f9abdd9b37d62ca7910966] Merge tag 's390-5.16-5' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux testing commit d9c1e6409cf47585a1f9abdd9b37d62ca7910966 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 69704f77fc46a63c799deb1c37621d77ec43ebde51c97a68a4eaf49a2073afcc all runs: OK # git bisect bad d9c1e6409cf47585a1f9abdd9b37d62ca7910966 Bisecting: 962 revisions left to test after this (roughly 10 steps) [703374418e93006a4b42a9b607e8e438bdf6b087] Merge tag 'staging-5.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging testing commit 703374418e93006a4b42a9b607e8e438bdf6b087 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 988160fc25ad857a36827b6a8a831561c9b20a0d8045ae34ab5967d2956b98f7 all runs: crashed: WARNING in rtnl_dellink # git bisect good 703374418e93006a4b42a9b607e8e438bdf6b087 Bisecting: 481 revisions left to test after this (roughly 9 steps) [bbef3c7a63d2a4cb0f3f839db9e767f168c5e348] Merge tag 'block-5.16-2021-12-03' of git://git.kernel.dk/linux-block testing commit bbef3c7a63d2a4cb0f3f839db9e767f168c5e348 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: ce1d0abccaccfac8211089f0ff623e68f79c98b01c614f124f061d6b24b2555d all runs: OK # git bisect bad bbef3c7a63d2a4cb0f3f839db9e767f168c5e348 Bisecting: 238 revisions left to test after this (roughly 8 steps) [52e81b6954321a577aeb99486fd6e980e9eafa6a] Merge tag 'amd-drm-fixes-5.16-2021-12-01' of https://gitlab.freedesktop.org/agd5f/linux into drm-fixes testing commit 52e81b6954321a577aeb99486fd6e980e9eafa6a compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 11223a566c8781695ac7bed0da28db6d39e678a73155f882974f55594b540316 all runs: crashed: WARNING in rtnl_dellink # git bisect good 52e81b6954321a577aeb99486fd6e980e9eafa6a Bisecting: 146 revisions left to test after this (roughly 7 steps) [88362ebfd7fb569c78d5cb507aa9d3c8fc203839] net: dsa: b53: Add SPI ID table testing commit 88362ebfd7fb569c78d5cb507aa9d3c8fc203839 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: e048e56d15a878bf902e05b8f76a1ce3d5194f15e94c1e1cea0ac114ea080dff all runs: OK # git bisect bad 88362ebfd7fb569c78d5cb507aa9d3c8fc203839 Bisecting: 45 revisions left to test after this (roughly 6 steps) [ffdf45315226926e5ae5faf0ff76caca68f6d39c] net/mlx5: Lag, Fix recreation of VF LAG testing commit ffdf45315226926e5ae5faf0ff76caca68f6d39c compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 8f37d7e1b16ec2dd9fa36fe0d57e621e67369ba8767f0b4b95a344b1c0300108 all runs: OK # git bisect bad ffdf45315226926e5ae5faf0ff76caca68f6d39c Bisecting: 22 revisions left to test after this (roughly 5 steps) [782c72af567fc2ef09bd7615d0307f24de72c7e0] wireguard: selftests: actually test for routing loops testing commit 782c72af567fc2ef09bd7615d0307f24de72c7e0 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: bf88d71b837b79aa76bcbd50de41d69d8aa3e70184e2324384759ff8f2d05457 all runs: crashed: WARNING in rtnl_dellink # git bisect good 782c72af567fc2ef09bd7615d0307f24de72c7e0 Bisecting: 11 revisions left to test after this (roughly 4 steps) [5fdc2333e6c3e7ef8b98295024bef27f8edf9202] Merge tag 'rxrpc-fixes-20211129' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs testing commit 5fdc2333e6c3e7ef8b98295024bef27f8edf9202 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: d1418d578b95d5a33dcd7c1bd2ed9305d67b086d51da4fc58cf4100b426049e0 all runs: crashed: WARNING in rtnl_dellink # git bisect good 5fdc2333e6c3e7ef8b98295024bef27f8edf9202 Bisecting: 5 revisions left to test after this (roughly 3 steps) [f123cffdd8fe8ea6c7fded4b88516a42798797d0] net: netlink: af_netlink: Prevent empty skb by adding a check on len. testing commit f123cffdd8fe8ea6c7fded4b88516a42798797d0 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 8f37d7e1b16ec2dd9fa36fe0d57e621e67369ba8767f0b4b95a344b1c0300108 all runs: OK # git bisect bad f123cffdd8fe8ea6c7fded4b88516a42798797d0 Bisecting: 2 revisions left to test after this (roughly 2 steps) [d1ec975f9fa6d2211c1f403010361034a87e317f] ice: xsk: clear status_error0 for each allocated desc testing commit d1ec975f9fa6d2211c1f403010361034a87e317f compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: d1418d578b95d5a33dcd7c1bd2ed9305d67b086d51da4fc58cf4100b426049e0 all runs: crashed: WARNING in rtnl_dellink # git bisect good d1ec975f9fa6d2211c1f403010361034a87e317f Bisecting: 0 revisions left to test after this (roughly 1 step) [34d8778a943761121f391b7921f79a7adbe1feaf] MAINTAINERS: s390/net: add Alexandra and Wenjia as maintainer testing commit 34d8778a943761121f391b7921f79a7adbe1feaf compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: d1418d578b95d5a33dcd7c1bd2ed9305d67b086d51da4fc58cf4100b426049e0 all runs: crashed: WARNING in rtnl_dellink # git bisect good 34d8778a943761121f391b7921f79a7adbe1feaf f123cffdd8fe8ea6c7fded4b88516a42798797d0 is the first bad commit commit f123cffdd8fe8ea6c7fded4b88516a42798797d0 Author: Harshit Mogalapalli Date: Mon Nov 29 09:53:27 2021 -0800 net: netlink: af_netlink: Prevent empty skb by adding a check on len. Adding a check on len parameter to avoid empty skb. This prevents a division error in netem_enqueue function which is caused when skb->len=0 and skb->data_len=0 in the randomized corruption step as shown below. skb->data[prandom_u32() % skb_headlen(skb)] ^= 1<<(prandom_u32() % 8); Crash Report: [ 343.170349] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 343.216110] netem: version 1.3 [ 343.235841] divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 343.236680] CPU: 3 PID: 4288 Comm: reproducer Not tainted 5.16.0-rc1+ [ 343.237569] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014 [ 343.238707] RIP: 0010:netem_enqueue+0x1590/0x33c0 [sch_netem] [ 343.239499] Code: 89 85 58 ff ff ff e8 5f 5d e9 d3 48 8b b5 48 ff ff ff 8b 8d 50 ff ff ff 8b 85 58 ff ff ff 48 8b bd 70 ff ff ff 31 d2 2b 4f 74 f1 48 b8 00 00 00 00 00 fc ff df 49 01 d5 4c 89 e9 48 c1 e9 03 [ 343.241883] RSP: 0018:ffff88800bcd7368 EFLAGS: 00010246 [ 343.242589] RAX: 00000000ba7c0a9c RBX: 0000000000000001 RCX: 0000000000000000 [ 343.243542] RDX: 0000000000000000 RSI: ffff88800f8edb10 RDI: ffff88800f8eda40 [ 343.244474] RBP: ffff88800bcd7458 R08: 0000000000000000 R09: ffffffff94fb8445 [ 343.245403] R10: ffffffff94fb8336 R11: ffffffff94fb8445 R12: 0000000000000000 [ 343.246355] R13: ffff88800a5a7000 R14: ffff88800a5b5800 R15: 0000000000000020 [ 343.247291] FS: 00007fdde2bd7700(0000) GS:ffff888109780000(0000) knlGS:0000000000000000 [ 343.248350] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 343.249120] CR2: 00000000200000c0 CR3: 000000000ef4c000 CR4: 00000000000006e0 [ 343.250076] Call Trace: [ 343.250423] [ 343.250713] ? memcpy+0x4d/0x60 [ 343.251162] ? netem_init+0xa0/0xa0 [sch_netem] [ 343.251795] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.252443] netem_enqueue+0xe28/0x33c0 [sch_netem] [ 343.253102] ? stack_trace_save+0x87/0xb0 [ 343.253655] ? filter_irq_stacks+0xb0/0xb0 [ 343.254220] ? netem_init+0xa0/0xa0 [sch_netem] [ 343.254837] ? __kasan_check_write+0x14/0x20 [ 343.255418] ? _raw_spin_lock+0x88/0xd6 [ 343.255953] dev_qdisc_enqueue+0x50/0x180 [ 343.256508] __dev_queue_xmit+0x1a7e/0x3090 [ 343.257083] ? netdev_core_pick_tx+0x300/0x300 [ 343.257690] ? check_kcov_mode+0x10/0x40 [ 343.258219] ? _raw_spin_unlock_irqrestore+0x29/0x40 [ 343.258899] ? __kasan_init_slab_obj+0x24/0x30 [ 343.259529] ? setup_object.isra.71+0x23/0x90 [ 343.260121] ? new_slab+0x26e/0x4b0 [ 343.260609] ? kasan_poison+0x3a/0x50 [ 343.261118] ? kasan_unpoison+0x28/0x50 [ 343.261637] ? __kasan_slab_alloc+0x71/0x90 [ 343.262214] ? memcpy+0x4d/0x60 [ 343.262674] ? write_comp_data+0x2f/0x90 [ 343.263209] ? __kasan_check_write+0x14/0x20 [ 343.263802] ? __skb_clone+0x5d6/0x840 [ 343.264329] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.264958] dev_queue_xmit+0x1c/0x20 [ 343.265470] netlink_deliver_tap+0x652/0x9c0 [ 343.266067] netlink_unicast+0x5a0/0x7f0 [ 343.266608] ? netlink_attachskb+0x860/0x860 [ 343.267183] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.267820] ? write_comp_data+0x2f/0x90 [ 343.268367] netlink_sendmsg+0x922/0xe80 [ 343.268899] ? netlink_unicast+0x7f0/0x7f0 [ 343.269472] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.270099] ? write_comp_data+0x2f/0x90 [ 343.270644] ? netlink_unicast+0x7f0/0x7f0 [ 343.271210] sock_sendmsg+0x155/0x190 [ 343.271721] ____sys_sendmsg+0x75f/0x8f0 [ 343.272262] ? kernel_sendmsg+0x60/0x60 [ 343.272788] ? write_comp_data+0x2f/0x90 [ 343.273332] ? write_comp_data+0x2f/0x90 [ 343.273869] ___sys_sendmsg+0x10f/0x190 [ 343.274405] ? sendmsg_copy_msghdr+0x80/0x80 [ 343.274984] ? slab_post_alloc_hook+0x70/0x230 [ 343.275597] ? futex_wait_setup+0x240/0x240 [ 343.276175] ? security_file_alloc+0x3e/0x170 [ 343.276779] ? write_comp_data+0x2f/0x90 [ 343.277313] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.277969] ? write_comp_data+0x2f/0x90 [ 343.278515] ? __fget_files+0x1ad/0x260 [ 343.279048] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.279685] ? write_comp_data+0x2f/0x90 [ 343.280234] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.280874] ? sockfd_lookup_light+0xd1/0x190 [ 343.281481] __sys_sendmsg+0x118/0x200 [ 343.281998] ? __sys_sendmsg_sock+0x40/0x40 [ 343.282578] ? alloc_fd+0x229/0x5e0 [ 343.283070] ? write_comp_data+0x2f/0x90 [ 343.283610] ? write_comp_data+0x2f/0x90 [ 343.284135] ? __sanitizer_cov_trace_pc+0x21/0x60 [ 343.284776] ? ktime_get_coarse_real_ts64+0xb8/0xf0 [ 343.285450] __x64_sys_sendmsg+0x7d/0xc0 [ 343.285981] ? syscall_enter_from_user_mode+0x4d/0x70 [ 343.286664] do_syscall_64+0x3a/0x80 [ 343.287158] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 343.287850] RIP: 0033:0x7fdde24cf289 [ 343.288344] Code: 01 00 48 81 c4 80 00 00 00 e9 f1 fe ff ff 0f 1f 00 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 8b 0d b7 db 2c 00 f7 d8 64 89 01 48 [ 343.290729] RSP: 002b:00007fdde2bd6d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 343.291730] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdde24cf289 [ 343.292673] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000004 [ 343.293618] RBP: 00007fdde2bd6e20 R08: 0000000100000001 R09: 0000000000000000 [ 343.294557] R10: 0000000100000001 R11: 0000000000000246 R12: 0000000000000000 [ 343.295493] R13: 0000000000021000 R14: 0000000000000000 R15: 00007fdde2bd7700 [ 343.296432] [ 343.296735] Modules linked in: sch_netem ip6_vti ip_vti ip_gre ipip sit ip_tunnel geneve macsec macvtap tap ipvlan macvlan 8021q garp mrp hsr wireguard libchacha20poly1305 chacha_x86_64 poly1305_x86_64 ip6_udp_tunnel udp_tunnel libblake2s blake2s_x86_64 libblake2s_generic curve25519_x86_64 libcurve25519_generic libchacha xfrm_interface xfrm6_tunnel tunnel4 veth netdevsim psample batman_adv nlmon dummy team bonding tls vcan ip6_gre ip6_tunnel tunnel6 gre tun ip6t_rpfilter ipt_REJECT nf_reject_ipv4 ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set ebtable_nat ebtable_broute ip6table_nat ip6table_mangle ip6table_security ip6table_raw iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_security iptable_raw ebtable_filter ebtables rfkill ip6table_filter ip6_tables iptable_filter ppdev bochs drm_vram_helper drm_ttm_helper ttm drm_kms_helper cec parport_pc drm joydev floppy parport sg syscopyarea sysfillrect sysimgblt i2c_piix4 qemu_fw_cfg fb_sys_fops pcspkr [ 343.297459] ip_tables xfs virtio_net net_failover failover sd_mod sr_mod cdrom t10_pi ata_generic pata_acpi ata_piix libata virtio_pci virtio_pci_legacy_dev serio_raw virtio_pci_modern_dev dm_mirror dm_region_hash dm_log dm_mod [ 343.311074] Dumping ftrace buffer: [ 343.311532] (ftrace buffer empty) [ 343.312040] ---[ end trace a2e3db5a6ae05099 ]--- [ 343.312691] RIP: 0010:netem_enqueue+0x1590/0x33c0 [sch_netem] [ 343.313481] Code: 89 85 58 ff ff ff e8 5f 5d e9 d3 48 8b b5 48 ff ff ff 8b 8d 50 ff ff ff 8b 85 58 ff ff ff 48 8b bd 70 ff ff ff 31 d2 2b 4f 74 f1 48 b8 00 00 00 00 00 fc ff df 49 01 d5 4c 89 e9 48 c1 e9 03 [ 343.315893] RSP: 0018:ffff88800bcd7368 EFLAGS: 00010246 [ 343.316622] RAX: 00000000ba7c0a9c RBX: 0000000000000001 RCX: 0000000000000000 [ 343.317585] RDX: 0000000000000000 RSI: ffff88800f8edb10 RDI: ffff88800f8eda40 [ 343.318549] RBP: ffff88800bcd7458 R08: 0000000000000000 R09: ffffffff94fb8445 [ 343.319503] R10: ffffffff94fb8336 R11: ffffffff94fb8445 R12: 0000000000000000 [ 343.320455] R13: ffff88800a5a7000 R14: ffff88800a5b5800 R15: 0000000000000020 [ 343.321414] FS: 00007fdde2bd7700(0000) GS:ffff888109780000(0000) knlGS:0000000000000000 [ 343.322489] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 343.323283] CR2: 00000000200000c0 CR3: 000000000ef4c000 CR4: 00000000000006e0 [ 343.324264] Kernel panic - not syncing: Fatal exception in interrupt [ 343.333717] Dumping ftrace buffer: [ 343.334175] (ftrace buffer empty) [ 343.334653] Kernel Offset: 0x13600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 343.336027] Rebooting in 86400 seconds.. Reported-by: syzkaller Signed-off-by: Harshit Mogalapalli Link: https://lore.kernel.org/r/20211129175328.55339-1-harshit.m.mogalapalli@oracle.com Signed-off-by: Jakub Kicinski net/netlink/af_netlink.c | 5 +++++ 1 file changed, 5 insertions(+) culprit signature: 8f37d7e1b16ec2dd9fa36fe0d57e621e67369ba8767f0b4b95a344b1c0300108 parent signature: d1418d578b95d5a33dcd7c1bd2ed9305d67b086d51da4fc58cf4100b426049e0 revisions tested: 18, total time: 3h38m7.052323544s (build: 1h42m11.644121329s, test: 1h53m26.185143732s) first good commit: f123cffdd8fe8ea6c7fded4b88516a42798797d0 net: netlink: af_netlink: Prevent empty skb by adding a check on len. recipients (to): ["davem@davemloft.net" "harshit.m.mogalapalli@oracle.com" "kuba@kernel.org" "kuba@kernel.org" "netdev@vger.kernel.org"] recipients (cc): ["edumazet@google.com" "fw@strlen.de" "linux-kernel@vger.kernel.org" "yajun.deng@linux.dev"]