bisecting fixing commit since 34816d20f173a90389c8a7e641166d8ea9dce70a building syzkaller on e6b0d3140b98e8456fbd089d584e932e19257d94 testing commit 34816d20f173a90389c8a7e641166d8ea9dce70a with gcc (GCC) 8.1.0 kernel signature: db58300667745a3c5c8e24f4fc1922f98ab6b1b00d01b214c3d3a66c7403bb35 all runs: crashed: general protection fault in ieee80211_chanctx_num_assigned testing current HEAD eda809aef53426d044b519405d25d9da55319b76 testing commit eda809aef53426d044b519405d25d9da55319b76 with gcc (GCC) 8.1.0 kernel signature: 87564d7621d6ee19a790b1719b0c11fe5cf9626effbfde90dc392b9f75c07f1c all runs: crashed: general protection fault in ieee80211_chanctx_num_assigned revisions tested: 2, total time: 14m59.478439574s (build: 9m12.460385857s, test: 5m19.247039785s) the crash still happens on HEAD commit msg: Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi crash: general protection fault in ieee80211_chanctx_num_assigned general protection fault, probably for non-canonical address 0xdeacfffffffff7a8: 0000 [#1] PREEMPT SMP CPU: 1 PID: 10247 Comm: syz-executor.2 Not tainted 5.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ieee80211_chanctx_num_assigned+0x27/0x60 net/mac80211/chan.c:22 Code: 01 c3 cc 8b 05 f6 00 3b 02 53 48 89 f3 85 c0 75 31 48 8b 43 20 48 8d 73 20 48 8d 88 a8 f6 ff ff 48 39 c6 b8 00 00 00 00 74 16 <48> 8b 91 58 09 00 00 83 c0 01 48 8d 8a a8 f6 ff ff 48 39 d6 75 ea RSP: 0018:ffffc90002b8b890 EFLAGS: 00010206 RAX: 0000000000000001 RBX: ffff88811dcec480 RCX: deacfffffffff7a8 RDX: dead000000000100 RSI: ffff88811dcec4a0 RDI: ffffffff84a03dc6 RBP: 0000000000000000 R08: ffffffff833ce057 R09: 0000000000000001 R10: ffffc90002b8b918 R11: 0000000000000004 R12: ffff88811e4c0c80 R13: ffff88811dcec480 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f4cb20cf700(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000119c000 CR3: 000000011e4e2000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_assign_vif_chanctx+0x27a/0x7b0 net/mac80211/chan.c:746 __ieee80211_vif_release_channel+0x79/0x170 net/mac80211/chan.c:1619 ieee80211_vif_release_channel+0x3f/0x80 net/mac80211/chan.c:1833 ieee80211_ibss_disconnect+0x255/0x4d0 net/mac80211/ibss.c:735 ieee80211_ibss_leave+0xa/0xb0 net/mac80211/ibss.c:1871 rdev_leave_ibss net/wireless/rdev-ops.h:545 [inline] __cfg80211_leave_ibss+0x70/0x2b0 net/wireless/ibss.c:212 cfg80211_leave_ibss+0x35/0x50 net/wireless/ibss.c:230 cfg80211_change_iface+0x3c7/0x740 net/wireless/util.c:1047 nl80211_set_interface+0x14d/0x270 net/wireless/nl80211.c:3839 genl_family_rcv_msg_doit.isra.17+0x102/0x140 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0xdb/0x1e0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x276/0x4c0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:672 ____sys_sendmsg+0x1ed/0x230 net/socket.c:2345 ___sys_sendmsg+0x77/0xb0 net/socket.c:2399 __sys_sendmsg+0x52/0xa0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: 0d 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4cb20cec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002c000 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003 RBP: 000000000119bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf2c R13: 00007ffe7dba6dff R14: 00007f4cb20cf9c0 R15: 000000000119bf2c Modules linked in: ---[ end trace 53ed930c1081ac73 ]--- RIP: 0010:ieee80211_chanctx_num_assigned+0x27/0x60 net/mac80211/chan.c:22 Code: 01 c3 cc 8b 05 f6 00 3b 02 53 48 89 f3 85 c0 75 31 48 8b 43 20 48 8d 73 20 48 8d 88 a8 f6 ff ff 48 39 c6 b8 00 00 00 00 74 16 <48> 8b 91 58 09 00 00 83 c0 01 48 8d 8a a8 f6 ff ff 48 39 d6 75 ea RSP: 0018:ffffc90002b8b890 EFLAGS: 00010206 RAX: 0000000000000001 RBX: ffff88811dcec480 RCX: deacfffffffff7a8 RDX: dead000000000100 RSI: ffff88811dcec4a0 RDI: ffffffff84a03dc6 RBP: 0000000000000000 R08: ffffffff833ce057 R09: 0000000000000001 R10: ffffc90002b8b918 R11: 0000000000000004 R12: ffff88811e4c0c80 R13: ffff88811dcec480 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f4cb20cf700(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4cb208cdb8 CR3: 000000011e4e2000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400