Following kernel crash noticed on linux next 20211020 tag. while booting on qemu_arm devices.
Crash log, Starting Entropy Daemon based on the HAVEGE algorithm... [ 15.611450] ------------[ cut here ]------------ [ 15.614631] WARNING: CPU: 1 PID: 219 at include/linux/seqlock.h:271 gnet_stats_add_basic+0x2e0/0x548 [ 15.619863] Modules linked in: fuse [ 15.621820] CPU: 1 PID: 219 Comm: NetworkManager Not tainted 5.15.0-rc6-next-20211020 #1 [ 15.629011] Hardware name: Generic DT based system [ 15.632132] Backtrace: [ 15.633763] [<c159a598>] (dump_backtrace) from [<c159a7b0>] (show_stack+0x20/0x24) [ 15.640696] r7:00000009 r6:00000000 r5:c1c896e0 r4:60000013 [ 15.644135] [<c159a790>] (show_stack) from [<c15a41bc>] (dump_stack_lvl+0x60/0x78) [ 15.649336] [<c15a415c>] (dump_stack_lvl) from [<c15a41ec>] (dump_stack+0x18/0x1c) [ 15.656049] r7:00000009 r6:0000010f r5:c12ea968 r4:c1c796b4 [ 15.659501] [<c15a41d4>] (dump_stack) from [<c0356838>] (__warn+0xe0/0x144) [ 15.665905] [<c0356758>] (__warn) from [<c159b7d0>] (warn_slowpath_fmt+0x84/0xb8) [ 15.670799] r8:00000009 r7:c12ea968 r6:0000010f r5:c1c796b4 r4:00000000 [ 15.674824] [<c159b750>] (warn_slowpath_fmt) from [<c12ea968>] (gnet_stats_add_basic+0x2e0/0x548) [ 15.682438] r9:00000000 r8:c12eb178 r7:00000000 r6:c53b99d0 r5:c3365ea0 r4:00000000 [ 15.687144] [<c12ea688>] (gnet_stats_add_basic) from [<c12eb178>] (___gnet_stats_copy_basic+0x94/0x18c) [ 15.695278] r10:00000001 r9:c4d4d780 r8:c3365ea0 r7:00000000 r6:00000000 r5:c53b9a68 [ 15.700138] r4:c53b99d0 [ 15.701596] [<c12eb0e4>] (___gnet_stats_copy_basic) from [<c12eb298>] (gnet_stats_copy_basic+0x28/0x30) [ 15.709271] r10:00000000 r9:c5220cc0 r8:00000000 r7:c5408000 r6:00000000 r5:c5220cc0 [ 15.716754] r4:c3365e00 [ 15.718375] [<c12eb270>] (gnet_stats_copy_basic) from [<c137e5b0>] (tc_fill_qdisc+0x29c/0x45c) [ 15.723901] [<c137e314>] (tc_fill_qdisc) from [<c137e808>] (tc_dump_qdisc_root+0x98/0x1bc) [ 15.728747] r10:00000000 r9:c5220cc0 r8:c5053bb8 r7:00000000 r6:00000000 r5:00000000 [ 15.736183] r4:00000001 [ 15.738107] [<c137e770>] (tc_dump_qdisc_root) from [<c137f2ac>] (tc_dump_qdisc+0x174/0x25c) [ 15.745388] r10:00000001 r9:c234bb40 r8:c5220cc0 r7:00000000 r6:c5053bb8 r5:00000000 [ 15.749667] r4:c33f0000 [ 15.751277] [<c137f138>] (tc_dump_qdisc) from [<c1396460>] (netlink_dump+0x154/0x364) [ 15.758400] r10:00000000 r9:00007f00 r8:c5053bb8 r7:c4d4d780 r6:00007f00 r5:c5220cc0 [ 15.762750] r4:c5053800 [ 15.764050] [<c139630c>] (netlink_dump) from [<c1396fa4>] (__netlink_dump_start+0x174/0x224) [ 15.771348] r10:00000000 r9:c5053bb8 r8:00000000 r7:c53b9c7c r6:c5220d80 r5:c5205000 [ 15.776145] r4:c5053800 [ 15.777715] [<c1396e30>] (__netlink_dump_start) from [<c131d180>] (rtnetlink_rcv_msg+0x2f4/0x540) [ 15.785106] r9:00000000 r8:c137f138 r7:c5220d80 r6:c4d4d780 r5:00000000 r4:c5205000 [ 15.791886] [<c131ce8c>] (rtnetlink_rcv_msg) from [<c1399600>] (netlink_rcv_skb+0xc4/0x11c) [ 15.796838] r10:c4d4d780 r9:c5053a44 r8:00000024 r7:c5205000 r6:c4d4d780 r5:c131ce8c [ 15.801860] r4:c5220d80 [ 15.803413] [<c139953c>] (netlink_rcv_skb) from [<c1317b2c>] (rtnetlink_rcv+0x20/0x24) [ 15.810282] r8:00000000 r7:c5220d80 r6:c5053800 r5:00000024 r4:c304f800 [ 15.816716] [<c1317b0c>] (rtnetlink_rcv) from [<c1398c98>] (netlink_unicast+0x1a0/0x264) [ 15.822014] [<c1398af8>] (netlink_unicast) from [<c1398f68>] (netlink_sendmsg+0x20c/0x460) [ 15.827255] r10:c5053800 r9:00000000 r8:00000000 r7:c5220d80 r6:c4d4d780 r5:c53b9f48 [ 15.834244] r4:00000024 [ 15.835804] [<c1398d5c>] (netlink_sendmsg) from [<c12d0318>] (____sys_sendmsg+0x1e0/0x290) [ 15.843564] r10:c4d4d780 r9:c53b9dcc r8:00000000 r7:00000000 r6:c46adc00 r5:c1398d5c [ 15.848266] r4:c53b9f48 [ 15.849821] [<c12d0138>] (____sys_sendmsg) from [<c12d233c>] (___sys_sendmsg+0xb0/0xdc) [ 15.857074] r10:00000128 r9:00000000 r8:c4d4d780 r7:00000000 r6:c46adc00 r5:c53b9f48 [ 15.862000] r4:00000000 [ 15.863630] [<c12d228c>] (___sys_sendmsg) from [<c12d2514>] (sys_sendmsg+0x5c/0x98) [ 15.869879] r9:c4d4d780 r8:c03002a4 r7:befe879c r6:c4d4d780 r5:c46adc00 r4:00000000 [ 15.874816] [<c12d24b8>] (sys_sendmsg) from [<c03000c0>] (ret_fast_syscall+0x0/0x1c) [ 15.881956] Exception stack(0xc53b9fa8 to 0xc53b9ff0) [ 15.884954] 9fa0: 00000000 befe879c 00000007 befe879c 00000000 00000000 [ 15.891833] 9fc0: 00000000 befe879c 00000007 00000128 b6a62000 00000001 00000005 0027fe18 [ 15.897081] 9fe0: 00000000 befe8740 00000000 b6d71ec0 [ 15.900493] r7:00000128 r6:00000007 r5:befe879c r4:00000000 [ 15.906386] irq event stamp: 36305 [ 15.907882] hardirqs last enabled at (36313): [<c03e31c8>] __up_console_sem+0x60/0x70 [ 15.911674] hardirqs last disabled at (36320): [<c03e31b4>] __up_console_sem+0x4c/0x70 [ 15.918671] softirqs last enabled at (36304): [<c0301fec>] __do_softirq+0x32c/0x560 [ 15.922707] softirqs last disabled at (36261): [<c0360034>] __irq_exit_rcu+0x154/0x178 [ 15.922869] ---[ end trace 3190ec354e2b2e34 ]---
Full log, https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20211020/tes... https://lkft.validation.linaro.org/scheduler/job/3786488#L775
Build config: https://builds.tuxbuild.com/1zlLmMyDukg9DNVY8NUNkQ1d2ff/config
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
steps to reproduce: 1) https://builds.tuxbuild.com/1zlLmMyDukg9DNVY8NUNkQ1d2ff/tuxmake_reproducer.s... 2) boot qemu_arm with OE rootfs as showing in below command line. /usr/bin/qemu-system-aarch64 -cpu host,aarch64=off -machine virt-2.10,accel=kvm -nographic -net nic,model=virtio,macaddr=BA:DD:AD:CC:09:02 -net tap -m 2048 -monitor none -kernel kernel/zImage --append "console=ttyAMA0 root=/dev/vda rw" -hda rootfs/rpb-console-image-lkft-am57xx-evm-20211006160523.rootfs.ext4 -m 4096 -smp 2 -nographic
-- Linaro LKFT https://lkft.linaro.org