bisecting fixing commit since 5ee93551c703f8fa1a6c414a7d08f956de311df3
building syzkaller on d797d2018f9550530c469ce03b5ae36cfa1ebd23
testing commit 5ee93551c703f8fa1a6c414a7d08f956de311df3 with gcc (GCC) 8.1.0
kernel signature: 112ddda375e015ace78e0b6d7db5b9284ee2b7f6
all runs: crashed: BUG: unable to handle kernel paging request in init_srcu_struct_fields
testing current HEAD db5b9190ff8202b609fe802ccde41cb28669389f
testing commit db5b9190ff8202b609fe802ccde41cb28669389f with gcc (GCC) 8.1.0
kernel signature: de2b7415ce0f324440eb473e3b515e7776bdddd8
run #0: crashed: BUG: unable to handle kernel paging request in init_srcu_struct_fields
run #1: crashed: BUG: unable to handle kernel paging request in init_srcu_struct_fields
run #2: crashed: BUG: unable to handle kernel paging request in init_srcu_struct_fields
run #3: crashed: BUG: unable to handle kernel paging request in init_srcu_struct_fields
run #4: crashed: BUG: unable to handle kernel paging request in init_srcu_struct_fields
run #5: crashed: BUG: unable to handle kernel paging request in init_srcu_struct_fields
run #6: crashed: BUG: unable to handle kernel paging request in init_srcu_struct_fields
run #7: crashed: BUG: unable to handle kernel paging request in init_srcu_struct_fields
run #8: OK
run #9: OK
revisions tested: 2, total time: 38m6.935115161s (build: 17m58.845540561s, test: 19m36.055025791s)
the crash still happens on HEAD
commit msg: Linux 4.19.96
crash: BUG: unable to handle kernel paging request in init_srcu_struct_fields
BUG: unable to handle kernel paging request at ffffc90005ce08a8
PGD 12c2f0067 P4D 12c2f0067 PUD 21bc31067 PMD 97fb3067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8740 Comm: syz-executor.5 Not tainted 4.19.96-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:init_srcu_struct_nodes kernel/rcu/srcutree.c:157 [inline]
RIP: 0010:init_srcu_struct_fields+0xc1a/0x1340 kernel/rcu/srcutree.c:187
Code: 88 00 00 00 48 89 f8 48 c1 e8 03 0f b6 04 18 84 c0 74 08 3c 03 0f 8e 00 03 00 00 49 8d bd 98 01 00 00 44 89 f1 b8 01 00 00 00 <41> 2b 8c 24 88 00 00 00 48 89 fa 48 c1 ea 03 d3 e0 80 3c 1a 00 48
RSP: 0018:ffff888088e97ae8 EFLAGS: 00010246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000001 RDI: ffff8880aea00198
RBP: ffff888088e97bc0 R08: ffffed1015d64733 R09: 0000000000000000
R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: ffffc90005ce0820
R13: ffff8880aea00000 R14: 0000000000000000 R15: ffff8880aea000f0
FS:  00007fbc38c99700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90005ce08a8 CR3: 00000000a9411000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __init_srcu_struct+0x54/0x60 kernel/rcu/srcutree.c:203
 kvm_page_track_init+0x22/0x60 arch/x86/kvm/page_track.c:177
 kvm_arch_init_vm+0x4a9/0x5f0 arch/x86/kvm/x86.c:9020
 kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:683 [inline]
 kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3270 [inline]
 kvm_dev_ioctl+0x321/0x1540 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3322
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbc38c98c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbc38c996d4
R13: 00000000004c348b R14: 00000000004d7708 R15: 00000000ffffffff
Modules linked in:
CR2: ffffc90005ce08a8
---[ end trace 20b49a9fa391aecf ]---
RIP: 0010:init_srcu_struct_nodes kernel/rcu/srcutree.c:157 [inline]
RIP: 0010:init_srcu_struct_fields+0xc1a/0x1340 kernel/rcu/srcutree.c:187
Code: 88 00 00 00 48 89 f8 48 c1 e8 03 0f b6 04 18 84 c0 74 08 3c 03 0f 8e 00 03 00 00 49 8d bd 98 01 00 00 44 89 f1 b8 01 00 00 00 <41> 2b 8c 24 88 00 00 00 48 89 fa 48 c1 ea 03 d3 e0 80 3c 1a 00 48
RSP: 0018:ffff888088e97ae8 EFLAGS: 00010246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000001 RDI: ffff8880aea00198
RBP: ffff888088e97bc0 R08: ffffed1015d64733 R09: 0000000000000000
R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: ffffc90005ce0820
R13: ffff8880aea00000 R14: 0000000000000000 R15: ffff8880aea000f0
FS:  00007fbc38c99700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90005ce08a8 CR3: 00000000a9411000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400