On 10/02/2023 09:41, Krzysztof Kozlowski wrote: > > >> >> I was also wondering if it would be possible to turn on KASAN in your >> kernel, which should give us a little more info? > > I'll try with KASAN. Not much from the KASAN, except that kernel continues to boot and runs: [ 44.722846] vdd_vmem: disabling [ 44.793465] systemd[1]: Hostname set to <odroidhc1>. [ 45.357929] systemd[1]: bpf-lsm: BPF LSM hook not enabled in the kernel, BPF LSM not supported [ 45.980476] ================================================================== [ 45.986372] BUG: KASAN: null-ptr-deref in xdr_inline_decode+0x140/0x200 [ 45.992929] Read of size 4092 at addr 00000004 by task kworker/u16:3/71 [ 45.999513] [ 46.000940] CPU: 6 PID: 71 Comm: kworker/u16:3 Not tainted 6.2.0-rc7-00018-g0983f6bf2bfc #222 [ 46.009504] Hardware name: Samsung Exynos (Flattened Device Tree) [ 46.015542] Workqueue: rpciod rpc_async_schedule [ 46.020123] unwind_backtrace from show_stack+0x10/0x14 [ 46.025323] show_stack from dump_stack_lvl+0x58/0x70 [ 46.030301] dump_stack_lvl from kasan_report+0xa8/0xe0 [ 46.035501] kasan_report from kasan_check_range+0x94/0x1a0 [ 46.041048] kasan_check_range from memcpy+0x28/0x68 [ 46.045985] memcpy from xdr_inline_decode+0x140/0x200 [ 46.051098] xdr_inline_decode from nfs4_xdr_dec_read_plus+0x298/0x5b8 [ 46.057602] nfs4_xdr_dec_read_plus from call_decode+0x39c/0x530 [ 46.063581] call_decode from __rpc_execute+0x1f4/0xc5c [ 46.068776] __rpc_execute from rpc_async_schedule+0x2c/0x4c [ 46.074411] rpc_async_schedule from process_one_work+0x51c/0xc44 [ 46.080478] process_one_work from worker_thread+0x9c/0x7c0 [ 46.086022] worker_thread from kthread+0x16c/0x1b8 [ 46.090872] kthread from ret_from_fork+0x14/0x2c [ 46.095550] Exception stack(0xf0ba3fb0 to 0xf0ba3ff8) [ 46.100580] 3fa0: 00000000 00000000 00000000 00000000 [ 46.108740] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 46.116885] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [ 46.123461] ================================================================== [ 46.130774] Disabling lock debugging due to kernel taint [ 50.848579] systemd[1]: Queued start job for default target Graphical Interface. [ 50.877068] systemd[1]: Created slice Slice /system/getty. Decoded stacktrace is (this is master branch): [ 46.020123] unwind_backtrace from show_stack (arch/arm/kernel/traps.c:258) [ 46.025323] show_stack from dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4)) [ 46.030301] dump_stack_lvl from kasan_report (mm/kasan/report.c:184 mm/kasan/report.c:519) [ 46.035501] kasan_report from kasan_check_range (mm/kasan/generic.c:173 mm/kasan/generic.c:189) [ 46.041048] kasan_check_range from memcpy (mm/kasan/shadow.c:65) [ 46.045985] memcpy from xdr_inline_decode (net/sunrpc/xdr.c:1419 net/sunrpc/xdr.c:1454) [ 46.051098] xdr_inline_decode from nfs4_xdr_dec_read_plus (fs/nfs/nfs42xdr.c:1063 fs/nfs/nfs42xdr.c:1149 fs/nfs/nfs42xdr.c:1360 fs/nfs/nfs42xdr.c:1343) [ 46.057602] nfs4_xdr_dec_read_plus from call_decode (net/sunrpc/clnt.c:2595) [ 46.063581] call_decode from __rpc_execute (include/asm-generic/bitops/generic-non-atomic.h:128 net/sunrpc/sched.c:954) [ 46.068776] __rpc_execute from rpc_async_schedule (include/linux/sched/mm.h:336 net/sunrpc/sched.c:1035) [ 46.074411] rpc_async_schedule from process_one_work (kernel/workqueue.c:2294) [ 46.080478] process_one_work from worker_thread (include/linux/list.h:292 kernel/workqueue.c:2437) [ 46.086022] worker_thread from kthread (kernel/kthread.c:376) [ 46.090872] kthread from ret_from_fork (arch/arm/kernel/entry-common.S:149) Best regards, Krzysztof
