ci2 starts bisection 2023-04-09 06:53:16.459348605 +0000 UTC m=+122127.467689091
bisecting fixing commit since d9b4a0c83a2d405dd85bf32d672686146b9bedff
building syzkaller on 4fc6d98dc6e07cb8bfec99a0e049b31083fa09d1
ensuring issue is reproducible on original commit d9b4a0c83a2d405dd85bf32d672686146b9bedff

testing commit d9b4a0c83a2d405dd85bf32d672686146b9bedff gcc
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: fdf06b03a0be944069e4e3b815f8c342b057360d6553716240359a5cf3d30254
run #0: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0000c73b0] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #1: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0000c7450] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #2: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0000c7540] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #3: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0005eb6d0] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #4: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0000c7680] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #5: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0033101e0] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #6: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0025cc050] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #7: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0010be0a0] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #8: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0025cc2d0] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #9: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0010be1e0] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #10: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0025cc6e0] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #11: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc00288c5f0] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #12: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #13: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #14: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #15: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #16: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #17: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #18: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #19: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
testing current HEAD d86dfc4d95cd218246b10ca7adf22c8626547599
testing commit d86dfc4d95cd218246b10ca7adf22c8626547599 gcc
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: e33b72c6c328497f67279b4fbd857fdad123c7d61a36f985dc543a38cd84c36f
run #0: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc0025cc910] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #1: boot failed: create image operation failed: &{Code:QUOTA_EXCEEDED ErrorDetails:[0xc002b01c70] Location: Message:Quota 'T2A_CPUS' exceeded.  Limit: 64.0 in region us-central1. ForceSendFields:[] NullFields:[]}.
run #2: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #3: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #4: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #5: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #6: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #7: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #8: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
run #9: crashed: BUG: unable to handle kernel paging request in sctp_outq_tail
revisions tested: 2, total time: 46m22.637434356s (build: 38m30.773102842s, test: 6m6.620250598s)
the crash still happens on HEAD
commit msg: Linux 5.15.106
crash: BUG: unable to handle kernel paging request in sctp_outq_tail
Unable to handle kernel paging request at virtual address dfff800000000007
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000007] address between user and kernel address ranges
Internal error: Oops: 96000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 5344 Comm: syz-executor.1 Not tainted 5.15.106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : list_add_tail include/linux/list.h:100 [inline]
pc : sctp_outq_tail_data net/sctp/outqueue.c:91 [inline]
pc : sctp_outq_tail+0x23c/0x8b4 net/sctp/outqueue.c:299
lr : sctp_stream_out include/net/sctp/structs.h:1494 [inline]
lr : sctp_outq_tail_data net/sctp/outqueue.c:90 [inline]
lr : sctp_outq_tail+0x210/0x8b4 net/sctp/outqueue.c:299
sp : ffff80001d227290
x29: ffff80001d2272a0 x28: 0000000000000007 x27: dfff800000000000
x26: 0000000000000038 x25: 0000000000000030 x24: ffff0000e7803550
x23: ffff0000e7803518 x22: ffff0000e7803560 x21: ffff0000e7803500
x20: ffff0000d036c7f0 x19: 1fffe0001cf006ac x18: 0000000000000008
x17: 1fffe0003695598e x16: ffff8000106cc88c x15: 000000002002ffb4
x14: 0000000000000000 x13: 0000000000000000 x12: ffff700003a44e81
x11: 000000000000003f x10: 0000000000000007 x9 : 000000000000000c
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 000000000000003f
x5 : ffff80001d227420 x4 : ffff0000e77fd500 x3 : ffff80000fe9ee30
x2 : ffff0000d036c7f8 x1 : 00000000000000c0 x0 : ffff0000e78020c0
Call trace:
 list_add_tail include/linux/list.h:100 [inline]
 sctp_outq_tail_data net/sctp/outqueue.c:91 [inline]
 sctp_outq_tail+0x23c/0x8b4 net/sctp/outqueue.c:299
 sctp_cmd_send_msg net/sctp/sm_sideeffect.c:1114 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1777 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]
 sctp_do_sm+0x1668/0x42ac net/sctp/sm_sideeffect.c:1170
 sctp_primitive_SEND+0x9c/0xbc net/sctp/primitive.c:163
 sctp_sendmsg_to_asoc+0x8a0/0x1394 net/sctp/socket.c:1869
 sctp_sendmsg+0xf94/0x20b8 net/sctp/socket.c:2027
 inet_sendmsg+0x128/0x248 net/ipv4/af_inet.c:823
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 __sys_sendto+0x2ec/0x3fc net/socket.c:2039
 __do_sys_sendto net/socket.c:2051 [inline]
 __se_sys_sendto net/socket.c:2047 [inline]
 __arm64_sys_sendto+0xd4/0xf4 net/socket.c:2047
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x7c/0x250 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x160/0x1e4 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x4c/0xf0 arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 910062b7 9100e11a 9100c119 d343ff5c (387b6b89) 
---[ end trace 22bbe0eb00185bdc ]---
----------------
Code disassembly (best guess):
   0:	910062b7 	add	x23, x21, #0x18
   4:	9100e11a 	add	x26, x8, #0x38
   8:	9100c119 	add	x25, x8, #0x30
   c:	d343ff5c 	lsr	x28, x26, #3
* 10:	387b6b89 	ldrb	w9, [x28, x27] <-- trapping instruction