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Every once in a while (I'd say ~20-30% of all boots), I'm getting a kernel panic around the time init is started. I was debugging a kernel based on drm-misc-next-2021-05-17 today with KASAN enabled and got this, which looks related: [ 6.109454] mmc0: SDHCI controller on fe300000.sdhci [fe300000.sdhci] us= ing PIO [ 6.124819] bcmgenet fd580000.ethernet: configuring instance for externa= l RGMII (RX delay) [ 6.133391] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D [ 6.140736] BUG: KASAN: user-memory-access in skb_release_data+0x14c/0x1= fc [ 6.147748] Read of size 4 at addr 1c8befdc by task swapper/0/0 [ 6.153776]=20 [ 6.155300] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc1-v7l #165 [ 6.162214] Hardware name: BCM2711 [ 6.165679] Backtrace:=20 [ 6.168183] [] (dump_backtrace) from [] (show_stack+= 0x20/0x24) [ 6.175931] r7:c1e00000 r6:00000193 r5:00000000 r4:c837f8e0 [ 6.181683] [] (show_stack) from [] (dump_stack+0xb8= /0xdc) [ 6.189051] [] (dump_stack) from [] (kasan_report+0x= 11c/0x1c0) [ 6.196789] r9:cc97ff02 r8:cc57e400 r7:c0ea3628 r6:00000000 r5:00000000= r4:1c8befdc [ 6.204655] [] (kasan_report) from [] (__asan_load4+= 0x74/0x90) [ 6.212393] r7:cc97ff00 r6:00000000 r5:cc97ff28 r4:1c8befd4 [ 6.218144] [] (__asan_load4) from [] (skb_release_d= ata+0x14c/0x1fc) [ 6.226395] [] (skb_release_data) from [] (consume_s= kb+0x60/0x134) [ 6.234479] r10:0000a8d8 r9:cc560000 r8:00000000 r7:cc560580 r6:0000000= 1 r5:cc57e4ac [ 6.242438] r4:cc57e400 r3:cc97f680 [ 6.246074] [] (consume_skb) from [] (__dev_kfree_sk= b_any+0x60/0x64) [ 6.254337] r9:cc560000 r8:00000000 r7:cc560580 r6:00000001 r5:cc57e400= r4:c1e00000 [ 6.262203] [] (__dev_kfree_skb_any) from [] (bcmgen= et_rx_poll+0x578/0x770) [ 6.271081] r7:cc560580 r6:a8d81759 r5:cc57e400 r4:cc563ed8 [ 6.276831] [] (bcmgenet_rx_poll) from [] (__napi_po= ll+0x60/0x2b8) [ 6.284925] r10:c1e03d20 r9:c1e05d00 r8:cc563ee0 r7:c1e03d10 r6:0000004= 0 r5:00000001 [ 6.292881] r4:cc563ed8 [ 6.295460] [] (__napi_poll) from [] (net_rx_action+= 0x580/0x620) [ 6.303377] r10:c1e03d20 r9:c1e05d00 r8:0000012c r7:cc563edc r6:cc56000= 0 r5:cc563ed8 [ 6.311333] r4:c1e03d80 [ 6.313911] [] (net_rx_action) from [] (__do_softirq= +0x1f0/0x69c) [ 6.321916] r10:c1e00000 r9:00000008 r8:16b2f000 r7:00000003 r6:0000000= 4 r5:c18b9360 [ 6.329872] r4:c1e0508c [ 6.332449] [] (__do_softirq) from [] (irq_exit+0x18= 8/0x1b0) [ 6.340012] r10:16b2f000 r9:c1e03ec0 r8:16b2f000 r7:c1e03e28 r6:ffffc00= 0 r5:c1cc0940 [ 6.347969] r4:c1e06ea4 [ 6.350546] [] (irq_exit) from [] (__handle_domain_i= rq+0xc4/0x128) [ 6.353302] bcmgenet fd580000.ethernet eth0: Link is Down [ 6.358635] r9:c1e03ec0 r8:00000001 r7:00000000 r6:c1e00000 r5:00000000= r4:c1cbfe80 [ 6.371956] [] (__handle_domain_irq) from [] (gic_ha= ndle_irq+0x9c/0xb4) [ 6.380496] r10:f080200c r9:f0802000 r8:c1e03ec0 r7:c1e07878 r6:c1cbfe8= c r5:000000bd [ 6.388452] r4:000000bd [ 6.391030] [] (gic_handle_irq) from [] (__irq_svc+0= x5c/0x80) [ 6.398666] Exception stack(0xc1e03ec0 to 0xc1e03f08) [ 6.403821] 3ec0: c175a018 d87f0614 00000000 c0222bc0 c1e00000 c1e06e1c = 00000000 c1e06e6c [ 6.412145] 3ee0: c84ff712 c121e120 30c5387d c1e03f1c c175a018 c1e03f10 = c020a204 c020a208 [ 6.420459] 3f00: 60000013 ffffffff [ 6.424026] r10:30c5387d r9:c1e00000 r8:c84ff712 r7:c1e03ef4 r6:fffffff= f r5:60000013 [ 6.431983] r4:c020a208 [ 6.434561] [] (arch_cpu_idle) from [] (default_idle= _call+0x48/0x188) [ 6.442906] [] (default_idle_call) from [] (do_idle+= 0x11c/0x180) [ 6.450816] r9:c121e120 r8:c84ff712 r7:c1e06e6c r6:00000000 r5:c1e06e1c= r4:c1e00000 [ 6.458681] [] (do_idle) from [] (cpu_startup_entry+= 0x28/0x2c) [ 6.466416] r9:410fd083 r8:c187df68 r7:c1e00000 r6:ca9d6000 r5:c85201e0= r4:000000e1 [ 6.474283] [] (cpu_startup_entry) from [] (rest_ini= t+0x148/0x150) [ 6.482358] [] (rest_init) from [] (arch_call_rest_i= nit+0x18/0x1c) [ 6.490450] r7:c1e06dc0 r6:c1e00000 r5:c1e00000 r4:c851d5c0 [ 6.496202] [] (arch_call_rest_init) from [] (start_= kernel+0x3e0/0x424) [ 6.504723] [] (start_kernel) from [<00000000>] (0x0) [ 6.510776] r8:2eff9400 r7:00000c42 r6:30c0387d r5:00000000 r4:c1800334 [ 6.517584] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D [ 6.524921] Disabling lock debugging due to kernel taint [ 6.530467] 8<--- cut here --- [ 6.533628] Unable to handle kernel paging request at virtual address 1c= 8befdc [ 6.541025] pgd =3D (ptrval) [ 6.543837] [1c8befdc] *pgd=3D80000000004003, *pmd=3D00000000 [ 6.549431] Internal error: Oops: 206 [#1] SMP ARM [ 6.554311] Modules linked in: [ 6.557433] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G B 5.= 13.0-rc1-v7l #165 [ 6.565755] Hardware name: BCM2711 [ 6.569217] PC is at skb_release_data+0x14c/0x1fc [ 6.574015] LR is at end_report+0x6c/0xf0 [ 6.578109] pc : [] lr : [] psr: 60000113 [ 6.584484] sp : c1e03ac8 ip : c1e03a60 fp : c1e03af4 [ 6.589801] r10: cc57e462 r9 : cc97ff02 r8 : cc57e400 [ 6.595116] r7 : cc97ff00 r6 : 00000000 r5 : cc97ff28 r4 : 1c8befd4 [ 6.601755] r3 : 00000000 r2 : c1e0ccc0 r1 : c0514884 r0 : 00000001 [ 6.608393] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment= user [ 6.615657] Control: 30c5383d Table: 00003000 DAC: fffffffd [ 6.621497] Register r0 information: non-paged memory [ 6.626651] Register r1 information: non-slab/vmalloc memory [ 6.632418] Register r2 information: non-slab/vmalloc memory [ 6.638185] Register r3 information: NULL pointer [ 6.642981] Register r4 information: non-paged memory [ 6.648129] Register r5 information: non-slab/vmalloc memory [ 6.653895] Register r6 information: NULL pointer [ 6.658690] Register r7 information: non-slab/vmalloc memory [ 6.664455] Register r8 information: slab skbuff_head_cache start cc57e4= 00 pointer offset 0 size 48 [ 6.673715] Register r9 information: non-slab/vmalloc memory [ 6.679481] Register r10 information: slab skbuff_head_cache start cc57e= 400 pointer offset 98 size 48 [ 6.688914] Register r11 information: non-slab/vmalloc memory [ 6.694768] Register r12 information: non-slab/vmalloc memory [ 6.700621] Process swapper/0 (pid: 0, stack limit =3D 0x(ptrval)) [ 6.706730] Stack: (0xc1e03ac8 to 0xc1e04000) [ 6.711177] 3ac0: cc97f680 cc57e400 cc57e4ac 00000001 = cc560580 00000000 [ 6.719502] 3ae0: cc560000 0000a8d8 c1e03b1c c1e03af8 c0ea9d2c c0ea34e8 = c1e00000 cc57e400 [ 6.727825] 3b00: 00000001 cc560580 00000000 cc560000 c1e03b3c c1e03b20 = c0ec0d74 c0ea9cd8 [ 6.736149] 3b20: cc563ed8 cc57e400 a8d81759 cc560580 c1e03c54 c1e03b40 = c0c814d4 c0ec0d20 [ 6.744473] 3b40: c0210414 c05154fc c02103d8 ffffc000 c1e03b84 c1e03be0 = c1e03c20 b73c0778 [ 6.752795] 3b60: 00000040 cc5640e8 cc560588 cc560088 cc561944 cc563fe0 = cc561580 cc563fd8 [ 6.761118] 3b80: ca5c3c00 cc563fc8 cc563fd4 cc564078 0000000c 00000000 = c1e03be4 00000000 [ 6.769441] 3ba0: 00000000 cc563580 c0210430 00000000 00000000 cc920374 = c1e03be4 c1e03c88 [ 6.777764] 3bc0: 41b58ab3 c1730000 c0c80f5c cc920374 cc920340 00000001 = c1e03d04 c1e03be8 [ 6.786084] 3be0: 00000000 00000000 00000000 00000000 00000000 00000000 = c1e03c24 c1e03c08 [ 6.794406] 3c00: 41b58ab3 c16ca308 c02a73bc d87efd80 cab4d000 d87f0318 = c1e03c4c 0147adf0 [ 6.802729] 3c20: c175a5d0 b5ed3f2f c02012e8 cc563ed8 00000001 00000040 = c1e03d10 cc563ee0 [ 6.811052] 3c40: c1e05d00 c1e03d20 c1e03c94 c1e03c58 c0ed3f0c c0c80f68 = c03a9ed0 c05154fc [ 6.819376] 3c60: c03aa120 cc563ed8 60000113 c1e03d80 cc563ed8 cc560000 = cc563edc 0000012c [ 6.827700] 3c80: c1e05d00 c1e03d20 c1e03db4 c1e03c98 c0ed4a14 c0ed3eb8 = d87f0740 b73c079c [ 6.836023] 3ca0: c02104fc c1e00000 c1e00010 c1e00000 c1e03d40 16b2f000 = c1cc1740 c1e05d00 [ 6.844347] 3cc0: ffff8d38 c1e03d20 c0210430 0000004c c1e03d04 c1e03ce0 = c0c7e6e4 c051546c [ 6.852670] 3ce0: 41b58ab3 c17447f0 c0ed4494 cb17fc00 c1e03da0 0000004c = c1e03d54 c1e03d08 [ 6.860994] 3d00: c1e03e4c c1e03e28 c03a9eb0 c02367a4 c02cdd00 c051546c = d87efdc0 cb17fc44 [ 6.869316] 3d20: c1e03d20 c1e03d20 d87efdf0 cb17fc00 c1e03d54 c1e03d40 = c112b730 c051546c [ 6.877640] 3d40: c1e03d40 c1e03d40 c02367a4 c0201240 c02c8548 c1e00000 = c1cbec50 c02367a4 [ 6.885965] 3d60: c0201240 c1e00004 16b2f000 c1e00000 c1e03db4 c1e03d80 = c03a9ed0 c05154fc [ 6.894287] 3d80: 41b58ab3 b5ed3f2f c1e03db4 c1e0508c c18b9360 00000004 = 00000003 16b2f000 [ 6.902610] 3da0: 00000008 c1e00000 c1e03e24 c1e03db8 c02012e8 c0ed44a0 = c1e03de4 c1e03dc8 [ 6.910932] 3dc0: 00000001 00200002 c1213840 c1e05d00 ffff8d37 c18b92d4 = 0000000a c1cc0940 [ 6.919256] 3de0: c09eed7c c18b9350 c1e05080 c1e03db8 00000101 c1e06e1c = c1e03e24 c1e06ea4 [ 6.927580] 3e00: c1cc0940 ffffc000 c1e03e28 16b2f000 c1e03ec0 16b2f000 = c1e03e4c c1e03e28 [ 6.935901] 3e20: c02367a4 c0201104 c1cbfe80 00000000 c1e00000 00000000 = 00000001 c1e03ec0 [ 6.944224] 3e40: c1e03e84 c1e03e50 c02c75fc c0236628 c112af34 ca91f000 = c1e03ebc 000000bd [ 6.952547] 3e60: 000000bd c1cbfe8c c1e07878 c1e03ec0 f0802000 f080200c = c1e03ebc c1e03e88 [ 6.960872] 3e80: c09ef2b4 c02c7544 c03aa120 c021043c c020a204 c020a208 = 60000013 ffffffff [ 6.969195] 3ea0: c1e03ef4 c84ff712 c1e00000 30c5387d c1e03f1c c1e03ec0 = c0200abc c09ef224 [ 6.977516] 3ec0: c175a018 d87f0614 00000000 c0222bc0 c1e00000 c1e06e1c = 00000000 c1e06e6c [ 6.985840] 3ee0: c84ff712 c121e120 30c5387d c1e03f1c c175a018 c1e03f10 = c020a204 c020a208 [ 6.994163] 3f00: 60000013 ffffffff c020a1f4 00000000 c1e03f44 c1e03f20 = c112af34 c020a1c4 [ 7.002486] 3f20: c1e00000 c1e06e1c 00000000 c1e06e6c c84ff712 c121e120 = c1e03f6c c1e03f48 [ 7.010810] 3f40: c0287578 c112aef8 000000e1 c85201e0 ca9d6000 c1e00000 = c187df68 410fd083 [ 7.019134] 3f60: c1e03f7c c1e03f70 c0287a00 c0287468 c1e03f9c c1e03f80 = c111d7b8 c02879e4 [ 7.027458] 3f80: c851d5c0 c1e00000 c1e00000 c1e06dc0 c1e03fac c1e03fa0 = c1801534 c111d67c [ 7.035781] 3fa0: c1e03ff4 c1e03fb0 c1801990 c1801528 ffffffff ffffffff = 00000000 c18006b8 [ 7.044103] 3fc0: 00000000 c187df68 b5e8322f 00000000 410fd083 c1800334 = 00000000 30c0387d [ 7.052425] 3fe0: 00000c42 2eff9400 00000000 c1e03ff8 00000000 c18015bc = 00000000 00000000 [ 7.060734] Backtrace:=20 [ 7.063237] [] (skb_release_data) from [] (consume_s= kb+0x60/0x134) [ 7.071327] r10:0000a8d8 r9:cc560000 r8:00000000 r7:cc560580 r6:0000000= 1 r5:cc57e4ac [ 7.079286] r4:cc57e400 r3:cc97f680 [ 7.082923] [] (consume_skb) from [] (__dev_kfree_sk= b_any+0x60/0x64) [ 7.091187] r9:cc560000 r8:00000000 r7:cc560580 r6:00000001 r5:cc57e400= r4:c1e00000 [ 7.099054] [] (__dev_kfree_skb_any) from [] (bcmgen= et_rx_poll+0x578/0x770) [ 7.107934] r7:cc560580 r6:a8d81759 r5:cc57e400 r4:cc563ed8 [ 7.113686] [] (bcmgenet_rx_poll) from [] (__napi_po= ll+0x60/0x2b8) [ 7.121778] r10:c1e03d20 r9:c1e05d00 r8:cc563ee0 r7:c1e03d10 r6:0000004= 0 r5:00000001 [ 7.129735] r4:cc563ed8 [ 7.132313] [] (__napi_poll) from [] (net_rx_action+= 0x580/0x620) [ 7.140233] r10:c1e03d20 r9:c1e05d00 r8:0000012c r7:cc563edc r6:cc56000= 0 r5:cc563ed8 [ 7.148189] r4:c1e03d80 [ 7.150767] [] (net_rx_action) from [] (__do_softirq= +0x1f0/0x69c) [ 7.158772] r10:c1e00000 r9:00000008 r8:16b2f000 r7:00000003 r6:0000000= 4 r5:c18b9360 [ 7.166728] r4:c1e0508c [ 7.169306] [] (__do_softirq) from [] (irq_exit+0x18= 8/0x1b0) [ 7.176870] r10:16b2f000 r9:c1e03ec0 r8:16b2f000 r7:c1e03e28 r6:ffffc00= 0 r5:c1cc0940 [ 7.184827] r4:c1e06ea4 [ 7.187405] [] (irq_exit) from [] (__handle_domain_i= rq+0xc4/0x128) [ 7.195497] r9:c1e03ec0 r8:00000001 r7:00000000 r6:c1e00000 r5:00000000= r4:c1cbfe80 [ 7.203363] [] (__handle_domain_irq) from [] (gic_ha= ndle_irq+0x9c/0xb4) [ 7.211902] r10:f080200c r9:f0802000 r8:c1e03ec0 r7:c1e07878 r6:c1cbfe8= c r5:000000bd [ 7.219858] r4:000000bd [ 7.222436] [] (gic_handle_irq) from [] (__irq_svc+0= x5c/0x80) [ 7.230074] Exception stack(0xc1e03ec0 to 0xc1e03f08) [ 7.235228] 3ec0: c175a018 d87f0614 00000000 c0222bc0 c1e00000 c1e06e1c = 00000000 c1e06e6c [ 7.243552] 3ee0: c84ff712 c121e120 30c5387d c1e03f1c c175a018 c1e03f10 = c020a204 c020a208 [ 7.251865] 3f00: 60000013 ffffffff [ 7.255432] r10:30c5387d r9:c1e00000 r8:c84ff712 r7:c1e03ef4 r6:fffffff= f r5:60000013 [ 7.263389] r4:c020a208 [ 7.265967] [] (arch_cpu_idle) from [] (default_idle= _call+0x48/0x188) [ 7.274309] [] (default_idle_call) from [] (do_idle+= 0x11c/0x180) [ 7.282219] r9:c121e120 r8:c84ff712 r7:c1e06e6c r6:00000000 r5:c1e06e1c= r4:c1e00000 [ 7.290085] [] (do_idle) from [] (cpu_startup_entry+= 0x28/0x2c) [ 7.297821] r9:410fd083 r8:c187df68 r7:c1e00000 r6:ca9d6000 r5:c85201e0= r4:000000e1 [ 7.305687] [] (cpu_startup_entry) from [] (rest_ini= t+0x148/0x150) [ 7.313764] [] (rest_init) from [] (arch_call_rest_i= nit+0x18/0x1c) [ 7.321855] r7:c1e06dc0 r6:c1e00000 r5:c1e00000 r4:c851d5c0 [ 7.327606] [] (arch_call_rest_init) from [] (start_= kernel+0x3e0/0x424) [ 7.336126] [] (start_kernel) from [<00000000>] (0x0) [ 7.342179] r8:2eff9400 r7:00000c42 r6:30c0387d r5:00000000 r4:c1800334 [ 7.349000] Code: ebd9c790 e5954000 e2840008 ebd9c78d (e5943008)=20 [ 7.355247] ---[ end trace 38b3df6838c109c3 ]--- Let me know if you need any other information, thanks! Maxime --3plytasmu4pwlokc Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCYKujuwAKCRDj7w1vZxhR xbR2AP9T0fl1jE89RgnrFROQQdQDFxGP5IatNbGeGLDZggKyawD/X52DrpRFPFha tGWwbWHnVVy/foGmONjXtDb3XOe7UgQ= =TA7M -----END PGP SIGNATURE----- --3plytasmu4pwlokc--