BUG: assuming non migratable context at include/linux/filter.h:599
in_atomic(): 0, irqs_disabled(): 0, migration_disabled() 0 pid: 7137, name: syz.0.338
3 locks held by syz.0.338/7137:
 #0: ffff88807b220970 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1731 [inline]
 #0: ffff88807b220970 (sk_lock-AF_INET){+.+.}-{0:0}, at: sctp_sendmsg+0xb92/0x27e0 net/sctp/socket.c:1970
 #1: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 #1: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
 #1: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: __ip_queue_xmit+0x5c/0x1a00 net/ipv4/ip_output.c:470
 #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
 #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: nf_hook+0x9e/0x370 include/linux/netfilter.h:228
CPU: 0 PID: 7137 Comm: syz.0.338 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 __cant_migrate+0x234/0x2e0 kernel/sched/core.c:10269
 __bpf_prog_run include/linux/filter.h:599 [inline]
 bpf_prog_run include/linux/filter.h:619 [inline]
 nf_hook_run_bpf+0x90/0x1e0 net/netfilter/nf_bpf_link.c:20
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
 nf_hook+0x215/0x370 include/linux/netfilter.h:259
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip_output+0x16c/0x210 net/ipv4/ip_output.c:433
 dst_output include/net/dst.h:467 [inline]
 ip_local_out net/ipv4/ip_output.c:129 [inline]
 __ip_queue_xmit+0x1094/0x1a00 net/ipv4/ip_output.c:535
 sctp_packet_transmit+0x2488/0x2a30 net/sctp/output.c:653
 sctp_packet_singleton+0x234/0x330 net/sctp/outqueue.c:783
 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
 sctp_outq_flush+0x4f1/0x3100 net/sctp/outqueue.c:1212
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
 sctp_do_sm+0x52d6/0x59a0 net/sctp/sm_sideeffect.c:1169
 sctp_primitive_ASSOCIATE+0x95/0xc0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x101c/0x17f0 net/sctp/socket.c:1841
 sctp_sendmsg+0x1941/0x27e0 net/sctp/socket.c:2031
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
 ___sys_sendmsg+0x220/0x290 net/socket.c:2649
 __sys_sendmmsg+0x275/0x4a0 net/socket.c:2735
 __do_sys_sendmmsg net/socket.c:2764 [inline]
 __se_sys_sendmmsg net/socket.c:2761 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2761
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fbfe738ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbfe82aa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fbfe75b5fa0 RCX: 00007fbfe738ebe9
RDX: 0000000000000001 RSI: 0000200000000740 RDI: 0000000000000006
RBP: 00007fbfe7411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbfe75b6038 R14: 00007fbfe75b5fa0 R15: 00007ffe46e528d8
 </TASK>
BUG: using smp_processor_id() in preemptible [00000000] code: syz.0.338/7137
caller is __bpf_prog_run include/linux/filter.h:606 [inline]
caller is bpf_prog_run include/linux/filter.h:619 [inline]
caller is nf_hook_run_bpf+0x157/0x1e0 net/netfilter/nf_bpf_link.c:20
CPU: 1 PID: 7137 Comm: syz.0.338 Tainted: G        W          6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 check_preemption_disabled+0x104/0x110 lib/smp_processor_id.c:49
 __bpf_prog_run include/linux/filter.h:606 [inline]
 bpf_prog_run include/linux/filter.h:619 [inline]
 nf_hook_run_bpf+0x157/0x1e0 net/netfilter/nf_bpf_link.c:20
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
 nf_hook+0x215/0x370 include/linux/netfilter.h:259
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip_output+0x16c/0x210 net/ipv4/ip_output.c:433
 dst_output include/net/dst.h:467 [inline]
 ip_local_out net/ipv4/ip_output.c:129 [inline]
 __ip_queue_xmit+0x1094/0x1a00 net/ipv4/ip_output.c:535
 sctp_packet_transmit+0x2488/0x2a30 net/sctp/output.c:653
 sctp_packet_singleton+0x234/0x330 net/sctp/outqueue.c:783
 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
 sctp_outq_flush+0x4f1/0x3100 net/sctp/outqueue.c:1212
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
 sctp_do_sm+0x52d6/0x59a0 net/sctp/sm_sideeffect.c:1169
 sctp_primitive_ASSOCIATE+0x95/0xc0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x101c/0x17f0 net/sctp/socket.c:1841
 sctp_sendmsg+0x1941/0x27e0 net/sctp/socket.c:2031
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
 ___sys_sendmsg+0x220/0x290 net/socket.c:2649
 __sys_sendmmsg+0x275/0x4a0 net/socket.c:2735
 __do_sys_sendmmsg net/socket.c:2764 [inline]
 __se_sys_sendmmsg net/socket.c:2761 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2761
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fbfe738ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbfe82aa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fbfe75b5fa0 RCX: 00007fbfe738ebe9
RDX: 0000000000000001 RSI: 0000200000000740 RDI: 0000000000000006
RBP: 00007fbfe7411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbfe75b6038 R14: 00007fbfe75b5fa0 R15: 00007ffe46e528d8
 </TASK>