bisecting fixing commit since 990f227371a400c0fbcb98b75c91a7dbd65f6132 building syzkaller on 54ce1ed6b9fcb3b8d77c43dd4b3533e70cade414 testing commit 990f227371a400c0fbcb98b75c91a7dbd65f6132 compiler: gcc (GCC) 8.4.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 735181db9cf2e18986f05d6c7edc592d3fe083e7433e0ca97a4d10324e6ee55d all runs: crashed: WARNING in dev_change_net_namespace testing current HEAD 6e0567b7305209c2d689ce57180a63d8dc657ad8 testing commit 6e0567b7305209c2d689ce57180a63d8dc657ad8 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 058a717f175be8f8fefa97512b175eec80096734cb743890e91af12b887cc997 all runs: OK # git bisect start 6e0567b7305209c2d689ce57180a63d8dc657ad8 990f227371a400c0fbcb98b75c91a7dbd65f6132 Bisecting: 56376 revisions left to test after this (roughly 16 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [3aa139aa9fdc138a84243dc49dc18d9b40e1c6e4] Merge tag 'media/v5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media testing commit 3aa139aa9fdc138a84243dc49dc18d9b40e1c6e4 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: cdeb793f72078704ddac6bf2084c3c974187d351493430f5e17a3d58265c8673 all runs: crashed: WARNING in dev_change_net_namespace # git bisect good 3aa139aa9fdc138a84243dc49dc18d9b40e1c6e4 Bisecting: 28169 revisions left to test after this (roughly 15 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [4ca4256453effb885c1688633676682529593f82] Merge branch 'core-rcu.2021.08.28a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu testing commit 4ca4256453effb885c1688633676682529593f82 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 68fe557a92282787fca2062834106eaf45e63181932477494d945926512ada9f all runs: crashed: WARNING in __dev_change_net_namespace # git bisect good 4ca4256453effb885c1688633676682529593f82 Bisecting: 14080 revisions left to test after this (roughly 14 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [43aa0a195f06101bcb5d8d711bba0dd24b33a1a0] Merge tag 'objtool-core-2021-10-31' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit 43aa0a195f06101bcb5d8d711bba0dd24b33a1a0 compiler: gcc (GCC) 10.2.1 20210217 ./include/linux/page-flags.h:806:29: error: macro "PAGEFLAG_FALSE" requires 2 arguments, but only 1 given ./include/linux/page-flags.h:807:32: error: macro "TESTSCFLAG_FALSE" requires 2 arguments, but only 1 given ./include/linux/page-flags.h:806:1: error: unknown type name 'PAGEFLAG_FALSE' ./include/linux/page-flags.h:807:18: error: expected ';' before 'static' # git bisect skip 43aa0a195f06101bcb5d8d711bba0dd24b33a1a0 Bisecting: 14080 revisions left to test after this (roughly 14 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [7bc9ab0f42b3a640af8b2c60aa3a616056c1f47c] can: at91/janz-ican3: replace snprintf() in show functions with sysfs_emit() testing commit 7bc9ab0f42b3a640af8b2c60aa3a616056c1f47c compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 5c3b6c1ddb53c8d82566e9232ad55833192a6ca693afc7f47f076ee707a7146b all runs: crashed: WARNING in __dev_change_net_namespace # git bisect good 7bc9ab0f42b3a640af8b2c60aa3a616056c1f47c Bisecting: 6689 revisions left to test after this (roughly 13 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [ae45d84fc36d01dcb1007f4298871eec37907904] Merge tag 'dt-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc testing commit ae45d84fc36d01dcb1007f4298871eec37907904 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: cfb83adc2f80483d557ff9ededc3589e209cb703c8feed206b9e4a100f5d72cf all runs: crashed: WARNING in __dev_change_net_namespace # git bisect good ae45d84fc36d01dcb1007f4298871eec37907904 Bisecting: 3330 revisions left to test after this (roughly 12 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [3a9b0a46e1708b6b3c298f2cf22923cc5a2ca63f] Merge tag 'mfd-next-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd testing commit 3a9b0a46e1708b6b3c298f2cf22923cc5a2ca63f compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: b296aaed5736349ac8d6cf445c0a297fa570920f928ab52c97330e685b6055a1 all runs: crashed: WARNING in __dev_change_net_namespace # git bisect good 3a9b0a46e1708b6b3c298f2cf22923cc5a2ca63f Bisecting: 1628 revisions left to test after this (roughly 11 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [8d0112ac6fd001f95aabb084ec2ccaa3637bc344] Merge tag 'net-5.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net testing commit 8d0112ac6fd001f95aabb084ec2ccaa3637bc344 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 5f7efe8d465f0b93be89494d6bd4d538227ba7a1b3313e6d30086ea30f40c2fb all runs: crashed: WARNING in __dev_change_net_namespace # git bisect good 8d0112ac6fd001f95aabb084ec2ccaa3637bc344 Bisecting: 813 revisions left to test after this (roughly 10 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [ea22ba40debee29ee7257c42002409899e9311c1] can: m_can: make custom bittiming fields const testing commit ea22ba40debee29ee7257c42002409899e9311c1 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 04340a4b48e20404387bae85020136da7a434aed78345f86ae9e90b5a6410e93 all runs: OK # git bisect bad ea22ba40debee29ee7257c42002409899e9311c1 Bisecting: 407 revisions left to test after this (roughly 9 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [925c94371c5532659f8eb5bcf3b71f78622e4f68] Merge tag 'fuse-fixes-5.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse testing commit 925c94371c5532659f8eb5bcf3b71f78622e4f68 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: de17c59febb330f11e03771e0c9783fa9920d9169ff1b6cb7d5140c0848c1ad5 all runs: crashed: WARNING in __dev_change_net_namespace # git bisect good 925c94371c5532659f8eb5bcf3b71f78622e4f68 Bisecting: 203 revisions left to test after this (roughly 8 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [72f6a45202f20f0e1a46b0acb7803369cc53d0b8] Fix Comment of ETH_P_802_3_MIN testing commit 72f6a45202f20f0e1a46b0acb7803369cc53d0b8 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 0e74b8469c7e04657d23018a45f0e880a024bc963e9936170a2bbab80333df73 all runs: OK # git bisect bad 72f6a45202f20f0e1a46b0acb7803369cc53d0b8 Bisecting: 101 revisions left to test after this (roughly 7 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [8a075464d1e9317ffae0973dfe538a7511291a06] net: mscc: ocelot: don't downgrade timestamping RX filters in SIOCSHWTSTAMP testing commit 8a075464d1e9317ffae0973dfe538a7511291a06 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 06e61cd83b6fb8a56e2cd096ed8ad8b37500b205f6638727cb88bdf92431a68f all runs: crashed: WARNING in __dev_change_net_namespace # git bisect good 8a075464d1e9317ffae0973dfe538a7511291a06 Bisecting: 51 revisions left to test after this (roughly 6 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [cbd92e7d74314e10a90d12a8f18f6fc66be4fb16] Merge branch 'wireguard-siphash-patches-for-5-16-rc6' testing commit cbd92e7d74314e10a90d12a8f18f6fc66be4fb16 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 83c5641cc2c9d85cd5ba4a1a0a6b3640eeadae9e08bf719656d2a62ce9acb1f0 all runs: crashed: WARNING in __dev_change_net_namespace # git bisect good cbd92e7d74314e10a90d12a8f18f6fc66be4fb16 Bisecting: 28 revisions left to test after this (roughly 5 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [8c8cf0382257b28378eeff535150c087a653ca19] net/mlx5e: SHAMPO, Fix constant expression result testing commit 8c8cf0382257b28378eeff535150c087a653ca19 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 8c8cf0382257b28378eeff535150c087a653ca19 Bisecting: 10 revisions left to test after this (roughly 4 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [51ebf5db67f5c6aed79c05f1aa5137bdf5ca6614] net/mlx5e: Fix missing IPsec statistics on uplink representor testing commit 51ebf5db67f5c6aed79c05f1aa5137bdf5ca6614 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 51ebf5db67f5c6aed79c05f1aa5137bdf5ca6614 Bisecting: 5 revisions left to test after this (roughly 3 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [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 __dev_change_net_namespace # git bisect good d1ec975f9fa6d2211c1f403010361034a87e317f Bisecting: 2 revisions left to test after this (roughly 2 steps) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [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: 0 revisions left to test after this (roughly 1 step) warning: unable to access '/syzkaller/.config/git/ignore': Permission denied warning: unable to access '/syzkaller/.config/git/attributes': Permission denied [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 __dev_change_net_namespace # 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 warning: unable to access '/syzkaller/.config/git/attributes': Permission denied 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: 3h25m39.969269491s (build: 1h50m26.778929026s, test: 1h32m34.667288242s) 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): ["dsahern@kernel.org" "edumazet@google.com" "fw@strlen.de" "linux-kernel@vger.kernel.org" "marcelo.leitner@gmail.com" "yajun.deng@linux.dev"]