ci2 starts bisection 2023-07-06 21:17:51.629946599 +0000 UTC m=+31142.942995392 bisecting cause commit starting from 59b65efafe20d18e4d05e8b3f63445bc12cb2cda building syzkaller on 1a2f6297df2e11f3ef37e97803568cb1b9ef875b ensuring issue is reproducible on original commit 59b65efafe20d18e4d05e8b3f63445bc12cb2cda testing commit 59b65efafe20d18e4d05e8b3f63445bc12cb2cda gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 29e84b43d3d6d20ada023362dfc4beb67064beb3166c10f7fd34d6199f027a5e run #0: crashed: BUG: soft lockup in tc_modify_qdisc run #1: crashed: BUG: soft lockup in tc_modify_qdisc run #2: crashed: BUG: soft lockup in tc_modify_qdisc run #3: crashed: BUG: soft lockup in tc_modify_qdisc run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: BUG: soft lockup in tc_modify_qdisc run #8: crashed: BUG: soft lockup in tc_modify_qdisc run #9: crashed: BUG: soft lockup in tc_modify_qdisc run #10: crashed: BUG: soft lockup in tc_modify_qdisc run #11: crashed: BUG: soft lockup in tc_modify_qdisc run #12: crashed: BUG: soft lockup in tc_modify_qdisc run #13: crashed: BUG: soft lockup in tc_modify_qdisc run #14: crashed: BUG: soft lockup in tc_modify_qdisc run #15: crashed: BUG: soft lockup in tc_modify_qdisc run #16: crashed: BUG: soft lockup in tc_modify_qdisc run #17: crashed: BUG: soft lockup in tc_modify_qdisc run #18: crashed: BUG: soft lockup in tc_modify_qdisc run #19: crashed: BUG: soft lockup in tc_modify_qdisc run #20: crashed: BUG: soft lockup in tc_modify_qdisc run #21: crashed: BUG: soft lockup in tc_modify_qdisc run #22: crashed: BUG: soft lockup in tc_modify_qdisc run #23: crashed: BUG: soft lockup in tc_modify_qdisc run #24: crashed: BUG: soft lockup in tc_modify_qdisc run #25: crashed: BUG: soft lockup in tc_modify_qdisc run #26: crashed: BUG: soft lockup in tc_modify_qdisc run #27: crashed: BUG: soft lockup in tc_modify_qdisc run #28: crashed: BUG: soft lockup in tc_modify_qdisc run #29: crashed: BUG: soft lockup in tc_modify_qdisc run #30: crashed: no output from test machine run #31: crashed: no output from test machine run #32: crashed: no output from test machine run #33: crashed: no output from test machine run #34: crashed: BUG: soft lockup in tc_modify_qdisc run #35: crashed: BUG: soft lockup in tc_modify_qdisc run #36: crashed: BUG: soft lockup in tc_modify_qdisc run #37: crashed: BUG: soft lockup in tc_modify_qdisc run #38: crashed: no output from test machine run #39: crashed: no output from test machine representative crash: BUG: soft lockup in tc_modify_qdisc, types: [HANG] check whether we can drop unnecessary instrumentation disabling configs for [UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP LEAK], they are not needed testing commit 59b65efafe20d18e4d05e8b3f63445bc12cb2cda gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 876ed4ee8c926309c5bc80fe930825a9a67a95b1bd7953e7aa89c35f76199add run #0: crashed: BUG: workqueue lockup run #1: crashed: BUG: workqueue lockup run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: workqueue lockup run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: BUG: soft lockup in tc_modify_qdisc run #8: crashed: BUG: soft lockup in tc_modify_qdisc run #9: crashed: BUG: soft lockup in tc_modify_qdisc run #10: crashed: BUG: soft lockup in tc_modify_qdisc run #11: crashed: BUG: soft lockup in tc_modify_qdisc run #12: crashed: BUG: soft lockup in tc_modify_qdisc run #13: crashed: BUG: soft lockup in tc_modify_qdisc run #14: crashed: no output from test machine run #15: crashed: no output from test machine run #16: crashed: no output from test machine run #17: crashed: no output from test machine run #18: crashed: BUG: soft lockup in tc_modify_qdisc run #19: crashed: BUG: soft lockup in tc_modify_qdisc representative crash: BUG: soft lockup in tc_modify_qdisc, types: [HANG UNKNOWN] the bug reproduces without the instrumentation disabling configs for [LEAK UBSAN BUG KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing release v5.10.186 testing commit 381518b4a9165cd793599c1668c82079fcbcbe1f gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 0306d7ceff13a47c538c6dc8e3f33f5223df0c942667a627842ec8a724b9a371 run #0: crashed: BUG: workqueue lockup run #1: crashed: BUG: workqueue lockup run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: workqueue lockup run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: BUG: soft lockup in tc_modify_qdisc run #8: crashed: BUG: soft lockup in tc_modify_qdisc run #9: crashed: BUG: soft lockup in tc_modify_qdisc run #10: crashed: BUG: soft lockup in tc_modify_qdisc run #11: crashed: BUG: soft lockup in tc_modify_qdisc run #12: crashed: BUG: soft lockup in tc_modify_qdisc run #13: crashed: BUG: soft lockup in tc_modify_qdisc run #14: crashed: BUG: soft lockup in tc_modify_qdisc run #15: crashed: BUG: soft lockup in tc_modify_qdisc run #16: crashed: BUG: soft lockup in tc_modify_qdisc run #17: crashed: BUG: soft lockup in tc_modify_qdisc run #18: crashed: BUG: soft lockup in tc_modify_qdisc run #19: crashed: BUG: soft lockup in tc_modify_qdisc representative crash: BUG: soft lockup in tc_modify_qdisc, types: [HANG] testing release v5.10.185 testing commit ef0d5feb32ab7007d1316e9c5037cd7d9f7febbf gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 12c9bd4f5ff28524bbacc0f90e940b99c7c82bc2507f973b6a8a64991c68e312 all runs: OK # git bisect start 381518b4a9165cd793599c1668c82079fcbcbe1f ef0d5feb32ab7007d1316e9c5037cd7d9f7febbf Bisecting: 40 revisions left to test after this (roughly 5 steps) [ced13bc50ef0f0ba4f6ea8808792c472a0bcf308] net: qca_spi: Avoid high load if QCA7000 is not available testing commit ced13bc50ef0f0ba4f6ea8808792c472a0bcf308 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: b6e26aa1524d27816c8e01d78903fcc60ed435a371655415f3e420a7e78c3c73 all runs: OK # git bisect good ced13bc50ef0f0ba4f6ea8808792c472a0bcf308 Bisecting: 20 revisions left to test after this (roughly 4 steps) [49a2b18f49724b5504771a8d10f9ab57807afba4] HID: wacom: Add error check to wacom_parse_and_register() testing commit 49a2b18f49724b5504771a8d10f9ab57807afba4 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: f9daa50163abae99aa0212f8c634bf5cbfd4a558629a66d90db9d932b2205ec4 run #0: crashed: BUG: soft lockup in corrupted run #1: crashed: BUG: soft lockup in corrupted run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: workqueue lockup run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: BUG: soft lockup in tc_modify_qdisc run #8: crashed: BUG: soft lockup in tc_modify_qdisc run #9: crashed: BUG: soft lockup in tc_modify_qdisc run #10: crashed: BUG: soft lockup in tc_modify_qdisc run #11: crashed: BUG: soft lockup in tc_modify_qdisc run #12: crashed: BUG: soft lockup in tc_modify_qdisc run #13: crashed: BUG: soft lockup in tc_modify_qdisc run #14: crashed: BUG: soft lockup in tc_modify_qdisc run #15: crashed: BUG: soft lockup in tc_modify_qdisc run #16: crashed: BUG: soft lockup in tc_modify_qdisc run #17: crashed: BUG: soft lockup in tc_modify_qdisc run #18: crashed: no output from test machine run #19: crashed: no output from test machine representative crash: BUG: soft lockup in corrupted, types: [HANG] # git bisect bad 49a2b18f49724b5504771a8d10f9ab57807afba4 Bisecting: 9 revisions left to test after this (roughly 3 steps) [cebb5cee098442bec42232e06309b93edba4acee] net: dsa: mt7530: fix trapping frames on non-MT7621 SoC MT7530 switch testing commit cebb5cee098442bec42232e06309b93edba4acee gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: a504245f5511b9a13a82139b998e9d463192c0a1ff4bb94cd83ebef49ca0d51f all runs: OK # git bisect good cebb5cee098442bec42232e06309b93edba4acee Bisecting: 4 revisions left to test after this (roughly 2 steps) [caddeadd0d0331cd5746cc1a72a7afd43e469d13] Revert "net: phy: dp83867: perform soft reset and retain established link" testing commit caddeadd0d0331cd5746cc1a72a7afd43e469d13 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 8cec6f84d265759ed1d9aa236d1463b16322872f094b0ded4e232a523ea77fdd all runs: OK # git bisect good caddeadd0d0331cd5746cc1a72a7afd43e469d13 Bisecting: 2 revisions left to test after this (roughly 1 step) [304802e5b038e9e33e1b7fe5f933864e7a8e0ec1] gpio: Allow per-parent interrupt data testing commit 304802e5b038e9e33e1b7fe5f933864e7a8e0ec1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 551298f2253697cd1b726f89a4737a01bc2c01bd76704d8115171b39526d45cb run #0: crashed: BUG: soft lockup in tc_modify_qdisc run #1: crashed: BUG: soft lockup in tc_modify_qdisc run #2: crashed: BUG: soft lockup in tc_modify_qdisc run #3: crashed: BUG: soft lockup in tc_modify_qdisc run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: BUG: soft lockup in tc_modify_qdisc run #8: crashed: BUG: soft lockup in tc_modify_qdisc run #9: crashed: BUG: soft lockup in tc_modify_qdisc run #10: crashed: BUG: soft lockup in tc_modify_qdisc run #11: crashed: BUG: soft lockup in tc_modify_qdisc run #12: crashed: BUG: soft lockup in tc_modify_qdisc run #13: crashed: BUG: soft lockup in tc_modify_qdisc run #14: crashed: BUG: soft lockup in tc_modify_qdisc run #15: crashed: BUG: soft lockup in tc_modify_qdisc run #16: crashed: BUG: soft lockup in tc_modify_qdisc run #17: crashed: BUG: soft lockup in tc_modify_qdisc run #18: crashed: BUG: soft lockup in corrupted run #19: crashed: BUG: soft lockup in corrupted representative crash: BUG: soft lockup in tc_modify_qdisc, types: [HANG] # git bisect bad 304802e5b038e9e33e1b7fe5f933864e7a8e0ec1 Bisecting: 0 revisions left to test after this (roughly 0 steps) [bc75968b494ab9991e855ab429e850d415ac835e] sch_netem: acquire qdisc lock in netem_change() testing commit bc75968b494ab9991e855ab429e850d415ac835e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: b48a55ffac634877bd64d61429eb72bca92221590edb5860ff5df775dc47c371 run #0: crashed: BUG: workqueue lockup run #1: crashed: BUG: workqueue lockup run #2: crashed: BUG: soft lockup in tc_modify_qdisc run #3: crashed: BUG: soft lockup in tc_modify_qdisc run #4: crashed: BUG: soft lockup in tc_modify_qdisc run #5: crashed: BUG: soft lockup in tc_modify_qdisc run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: BUG: soft lockup in tc_modify_qdisc run #8: crashed: BUG: soft lockup in tc_modify_qdisc run #9: crashed: BUG: soft lockup in tc_modify_qdisc run #10: crashed: BUG: soft lockup in tc_modify_qdisc run #11: crashed: BUG: soft lockup in tc_modify_qdisc run #12: crashed: BUG: soft lockup in tc_modify_qdisc run #13: crashed: BUG: soft lockup in tc_modify_qdisc run #14: crashed: no output from test machine run #15: crashed: no output from test machine run #16: crashed: no output from test machine run #17: crashed: no output from test machine run #18: crashed: no output from test machine run #19: crashed: no output from test machine representative crash: BUG: soft lockup in tc_modify_qdisc, types: [HANG UNKNOWN] # git bisect bad bc75968b494ab9991e855ab429e850d415ac835e bc75968b494ab9991e855ab429e850d415ac835e is the first bad commit commit bc75968b494ab9991e855ab429e850d415ac835e Author: Eric Dumazet Date: Tue Jun 20 18:44:25 2023 +0000 sch_netem: acquire qdisc lock in netem_change() [ Upstream commit 2174a08db80d1efeea382e25ac41c4e7511eb6d6 ] syzbot managed to trigger a divide error [1] in netem. It could happen if q->rate changes while netem_enqueue() is running, since q->rate is read twice. It turns out netem_change() always lacked proper synchronization. [1] divide error: 0000 [#1] SMP KASAN CPU: 1 PID: 7867 Comm: syz-executor.1 Not tainted 6.1.30-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 RIP: 0010:div64_u64 include/linux/math64.h:69 [inline] RIP: 0010:packet_time_ns net/sched/sch_netem.c:357 [inline] RIP: 0010:netem_enqueue+0x2067/0x36d0 net/sched/sch_netem.c:576 Code: 89 e2 48 69 da 00 ca 9a 3b 42 80 3c 28 00 4c 8b a4 24 88 00 00 00 74 0d 4c 89 e7 e8 c3 4f 3b fd 48 8b 4c 24 18 48 89 d8 31 d2 <49> f7 34 24 49 01 c7 4c 8b 64 24 48 4d 01 f7 4c 89 e3 48 c1 eb 03 RSP: 0018:ffffc9000dccea60 EFLAGS: 00010246 RAX: 000001a442624200 RBX: 000001a442624200 RCX: ffff888108a4f000 RDX: 0000000000000000 RSI: 000000000000070d RDI: 000000000000070d RBP: ffffc9000dcceb90 R08: ffffffff849c5e26 R09: fffffbfff10e1297 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888108a4f358 R13: dffffc0000000000 R14: 0000001a8cd9a7ec R15: 0000000000000000 FS: 00007fa73fe18700(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa73fdf7718 CR3: 000000011d36e000 CR4: 0000000000350ee0 Call Trace: [] __dev_xmit_skb net/core/dev.c:3931 [inline] [] __dev_queue_xmit+0xcf5/0x3370 net/core/dev.c:4290 [] dev_queue_xmit include/linux/netdevice.h:3030 [inline] [] neigh_hh_output include/net/neighbour.h:531 [inline] [] neigh_output include/net/neighbour.h:545 [inline] [] ip_finish_output2+0xb92/0x10d0 net/ipv4/ip_output.c:235 [] __ip_finish_output+0xc3/0x2b0 [] ip_finish_output+0x31/0x2a0 net/ipv4/ip_output.c:323 [] NF_HOOK_COND include/linux/netfilter.h:298 [inline] [] ip_output+0x224/0x2a0 net/ipv4/ip_output.c:437 [] dst_output include/net/dst.h:444 [inline] [] ip_local_out net/ipv4/ip_output.c:127 [inline] [] __ip_queue_xmit+0x1425/0x2000 net/ipv4/ip_output.c:542 [] ip_queue_xmit+0x4c/0x70 net/ipv4/ip_output.c:556 Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: syzbot Signed-off-by: Eric Dumazet Cc: Stephen Hemminger Cc: Jamal Hadi Salim Cc: Cong Wang Cc: Jiri Pirko Reviewed-by: Jamal Hadi Salim Reviewed-by: Simon Horman Link: https://lore.kernel.org/r/20230620184425.1179809-1-edumazet@google.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin net/sched/sch_netem.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) culprit signature: b48a55ffac634877bd64d61429eb72bca92221590edb5860ff5df775dc47c371 parent signature: 8cec6f84d265759ed1d9aa236d1463b16322872f094b0ded4e232a523ea77fdd revisions tested: 10, total time: 4h8m13.726319037s (build: 1h54m41.975792465s, test: 2h1m47.604724675s) first bad commit: bc75968b494ab9991e855ab429e850d415ac835e sch_netem: acquire qdisc lock in netem_change() recipients (to): ["edumazet@google.com" "jhs@mojatatu.com" "pabeni@redhat.com" "sashal@kernel.org" "simon.horman@corigine.com"] recipients (cc): [] crash: BUG: soft lockup in tc_modify_qdisc RBP: 00007f2a216ab493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd8520c28f R14: 00007f2a211d3300 R15: 0000000000022000 watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz-executor.0:433] Modules linked in: CPU: 0 PID: 433 Comm: syz-executor.0 Not tainted 5.10.185-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:104 [inline] RIP: 0010:kvm_wait arch/x86/kernel/kvm.c:923 [inline] RIP: 0010:kvm_wait+0x3e/0x40 arch/x86/kernel/kvm.c:903 Code: 40 38 d6 74 03 50 9d c3 f6 c4 02 75 0f 0f 1f 44 00 00 0f 00 2d f1 76 35 01 f4 eb e9 0f 1f 44 00 00 0f 00 2d e2 76 35 01 fb f4 d9 8b 05 2a 89 d7 01 83 f8 ff 74 06 85 c0 0f 95 c0 c3 55 48 89 RSP: 0018:ffffc900006077b8 EFLAGS: 00000242 RAX: 0000000000000246 RBX: ffff888237c4a980 RCX: 0000000000000008 RDX: 0000000000000003 RSI: 0000000000000003 RDI: ffff8881059d84ac RBP: ffffc900006077f8 R08: ffff88823fff1980 R09: 0000000000000000 R10: 0000000000000001 R11: ffff888237c4a980 R12: ffff8881059d84ac R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000100 FS: 00007f2a211d3700(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000080 CR3: 000000010e287000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock include/linux/spinlock.h:183 [inline] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0x39/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] get_dist_table+0x92/0xd0 net/sched/sch_netem.c:798 netem_change+0x4da/0x5e0 net/sched/sch_netem.c:988 netem_init+0x41/0x60 net/sched/sch_netem.c:1075 qdisc_create+0x1a9/0x4b0 net/sched/sch_api.c:1264 tc_modify_qdisc+0x13c/0x8d0 net/sched/sch_api.c:1689 rtnetlink_rcv_msg+0x132/0x370 net/core/rtnetlink.c:5571 netlink_rcv_skb+0x4e/0xf0 net/netlink/af_netlink.c:2496 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5589 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x250/0x340 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x239/0x470 net/netlink/af_netlink.c:1915 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x35/0x40 net/socket.c:671 ____sys_sendmsg+0x23e/0x260 net/socket.c:2356 ___sys_sendmsg+0x74/0xc0 net/socket.c:2410 __sys_sendmsg+0x5d/0xb0 net/socket.c:2439 __do_sys_sendmsg net/socket.c:2448 [inline] __se_sys_sendmsg net/socket.c:2446 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2446 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f2a21660389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2a211d3168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2a2177ff80 RCX: 00007f2a21660389 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007f2a216ab493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd8520c28f R14: 00007f2a211d3300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:113 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x5a/0x60 drivers/acpi/processor_idle.c:575