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When the kernel is compiled with LTO using Clang 8.0.8 (AOSP Clang r349610), using mobile data results in a kernel panic within 1 minute: [ 96.276191] Unable to handle kernel NULL pointer dereference at virtual address 00000017 [ 96.276216] pgd = ffffff8b17b62000 [ 96.276222] [00000017] *pgd=000000017900b003, *pud=000000017900b003, *pmd=0000000000000000 [ 96.276239] Internal error: Oops: 96000006 [#1] PREEMPT SMP [ 96.276249] CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 4.9.158-Proton-v14 #904 [ 96.276254] Hardware name: Google Pixel 3 XL (DT) [ 96.276274] Workqueue: wg-crypt-VPS wg_packet_tx_worker [ 96.276281] task: ffffffc6f9145b00 task.stack: ffffffc6f9160000 [ 96.276291] PC is at htb_lookup_leaf+0xf4/0x188 [ 96.276296] LR is at htb_dequeue+0x4a4/0xc5c [ 96.276301] pc : [<ffffff8b1603d52c>] lr : [<ffffff8b1603be00>] pstate: 80c00145 [ 96.276305] sp : ffffffc6f9163940 [ 96.276309] x29: ffffffc6f91639e0 x28: 0000000000000008 [ 96.276317] x27: 0000000000000010 x26: 0000000000000000 [ 96.276325] x25: ffffffc6f9145b00 x24: 00000000000000a8 [ 96.276332] x23: 0000000000000000 x22: 0000000000000007 [ 96.276340] x21: 0000000000000080 x20: ffffffc6f56db328 [ 96.276348] x19: ffffffc6f56db000 x18: 0000000000021191 [ 96.276356] x17: ffffff8b166a1e08 x16: 0000000000000007 [ 96.276364] x15: ffffffc6f56db3e0 x14: 0000000000000007 [ 96.276371] x13: ffffffc6f9163880 x12: 0000000000000018 [ 96.276379] x11: fffffffffffffdb0 x10: 000000000000ffff [ 96.276386] x9 : ffffffc6f9163880 x8 : 0000000000000000 [ 96.276393] x7 : 0000000000000001 x6 : 00000080c6ffffff [ 96.276400] x5 : ffffffc600000000 x4 : 0000000000000000 [ 96.276407] x3 : 0000000000000000 x2 : ffffffc6f9163a48 [ 96.276415] x1 : 0000000000000007 x0 : ffffffc6f56db3d8 [ 96.276424] [ 96.276424] PC: 0xffffff8b1603d4ec: [ 96.276429] d4ec f94001f0 b4000170 8b0b0200 b940680f 340005cf 9b0c01cf f94061f0 910321f1 [ 96.276453] d50c 910341ef f8018db0 a900bdb1 14000023 f94001b0 f90001f0 f94005af f94001f0 [ 96.276474] d52c f9400a10 b5ffff90 eb0901bf 54000369 f85f01af f94001f1 b4000371 f9400230 [ 96.276496] d54c d10061ad eb11021f 54000081 aa1f03f0 f90001ff 14000011 f9400632 b40000b2 [ 96.276519] [ 96.276519] LR: 0xffffff8b1603bdc0: [ 96.276524] bdc0 dac00108 dac01116 f94027e8 9106a114 8b1606c8 1ad621f5 52801909 9b0952e9 [ 96.276545] bde0 2a0b02ab b90047eb d37df118 8b180128 91002100 f9001be0 2a1603e1 9400058f [ 96.276567] be00 aa0003e9 8b180288 91004118 aa0003f9 b5000197 1400005c f27ef529 540008c0 [ 96.276588] be20 f940052b eb0b015f 54000861 f940012b aa0903ea f27ef569 54ffff41 1400003e [ 96.276611] [ 96.276611] SP: 0xffffffc6f9163900: [ 96.276616] 3900 1603be00 ffffff8b f9163940 ffffffc6 1603d52c ffffff8b 80c00145 00000000 [ 96.276637] 3920 5ed18100 ffffffc6 63109138 ffffffc6 ffffffff ffffffff 1603ba64 ffffff8b [ 96.276659] 3940 5a92e0bc ffffffc6 f56db308 ffffffc6 f56db308 ffffffc6 71f3be66 00000016 [ 96.276681] 3960 0000c6f1 ffffffff f56db2c8 ffffffc6 f56db3d8 ffffffc6 00000000 00000000 [ 96.276704] Process kworker/1:0 (pid: 19, stack limit = 0xffffffc6f9160000) [ 96.276709] Call trace: [ 96.276715] Exception stack(0xffffffc6f9163810 to 0xffffffc6f9163940) [ 96.276721] 3800: ffffffc6f56db3d8 0000000000000007 [ 96.276726] 3820: ffffffc6f9163a48 0000000000000000 0000000000000000 ffffffc600000000 [ 96.276732] 3840: 00000080c6ffffff 0000000000000001 0000000000000000 ffffffc6f9163880 [ 96.276737] 3860: 000000000000ffff fffffffffffffdb0 0000000000000018 ffffffc6f9163880 [ 96.276742] 3880: 0000000000000007 ffffffc6f56db3e0 0000000000000007 ffffff8b166a1e08 [ 96.276748] 38a0: 0000000000021191 ffffffc6f56db000 ffffffc6f56db328 0000000000000080 [ 96.276753] 38c0: 0000000000000007 0000000000000000 00000000000000a8 ffffffc6f9145b00 [ 96.276758] 38e0: 0000000000000000 0000000000000010 0000000000000008 ffffffc6f91639e0 [ 96.276764] 3900: ffffff8b1603be00 ffffffc6f9163940 ffffff8b1603d52c 0000000080c00145 [ 96.276769] 3920: ffffffc65ed18100 ffffffc663109138 ffffffffffffffff ffffff8b1603ba64 [ 96.276775] [<ffffff8b1603d52c>] htb_lookup_leaf+0xf4/0x188 [ 96.276783] [<ffffff8b1602d774>] __qdisc_run+0x60/0x3e8 [ 96.276793] [<ffffff8b15ff7f9c>] __dev_queue_xmit+0x3e4/0xcdc [ 96.276800] [<ffffff8b160093fc>] neigh_direct_output+0x18/0x20 [ 96.276806] [<ffffff8b160bfee0>] ip_finish_output2+0x2f0/0x5ec [ 96.276811] [<ffffff8b160bfb18>] ip_finish_output+0x24c/0x324 [ 96.276817] [<ffffff8b160c13b8>] ip_output+0x180/0x23c [ 96.276826] [<ffffff8b1611f8a8>] iptunnel_xmit+0x17c/0x278 [ 96.276832] [<ffffff8b160a1ab8>] send4+0x380/0x578 [ 96.276837] [<ffffff8b160a167c>] wg_socket_send_skb_to_peer+0x80/0x13c [ 96.276842] [<ffffff8b1609f018>] wg_packet_tx_worker+0x10c/0x3bc [ 96.276851] [<ffffff8b14ed7e24>] process_one_work+0x16c/0x4c4 [ 96.276856] [<ffffff8b14ed7900>] worker_thread+0x410/0x6e4 [ 96.276863] [<ffffff8b14ee20c4>] kthread+0x204/0x238 [ 96.276872] [<ffffff8b14e82e80>] ret_from_fork+0x10/0x50 [ 96.276880] Code: f94001b0 f90001f0 f94005af f94001f0 (f9400a10) [ 96.276887] ---[ end trace 3153190ecb656787 ]--- Obviously I broke something, but this fixes it for now and HTB is not very performance-critical. There have been no panics within 1 hour of rigorous mobile data testing along with WireGuard after this change was made. Signed-off-by: kdrag0n <[email protected]>
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