bisecting fixing commit since f5d582777bcb1c7ff19a5a2343f66ea01de401c6 building syzkaller on 7795ae03c0d2358a40130693e40e0fcab5232ed2 testing commit f5d582777bcb1c7ff19a5a2343f66ea01de401c6 with gcc (GCC) 8.1.0 run #0: crashed: kernel BUG at arch/x86/mm/physaddr.c:LINE! run #1: crashed: general protection fault in move_linked_works run #2: crashed: general protection fault in __ip_append_data run #3: crashed: general protection fault in __bfs run #4: crashed: kernel BUG at arch/x86/mm/physaddr.c:LINE! run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing current HEAD 3039fadf2bfdc104dc963820c305778c7c1a6229 testing commit 3039fadf2bfdc104dc963820c305778c7c1a6229 with gcc (GCC) 8.1.0 all runs: crashed: BUG: using smp_processor_id() in preemptible [ADDR] code: syz-executor revisions tested: 2, total time: 27m10.433025599s (build: 11m20.516468111s, test: 14m3.003095494s) the crash still happens on HEAD crash: BUG: using smp_processor_id() in preemptible [ADDR] code: syz-executor 8021q: adding VLAN 0 to HW filter on device team0 Started in network mode Own node identity ac14142, cluster identity 4711 New replicast peer: 0.0.0.0 check_preemption_disabled: 3 callbacks suppressed BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor0/7448 caller is dst_cache_get+0x33/0xa0 net/core/dst_cache.c:68 CPU: 1 PID: 7448 Comm: syz-executor0 Not tainted 5.3.0-rc4+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 check_preemption_disabled lib/smp_processor_id.c:47 [inline] debug_smp_processor_id.cold.2+0x84/0x97 lib/smp_processor_id.c:57 dst_cache_get+0x33/0xa0 net/core/dst_cache.c:68 tipc_udp_xmit.isra.15+0xb9/0xc60 net/tipc/udp_media.c:164 tipc_udp_send_msg+0x229/0x3d0 net/tipc/udp_media.c:254 tipc_bearer_xmit_skb+0x12c/0x290 net/tipc/bearer.c:503 tipc_enable_bearer+0x7a6/0xab0 net/tipc/bearer.c:328 __tipc_nl_bearer_enable+0x265/0x390 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x1d/0x30 net/tipc/bearer.c:907 genl_family_rcv_msg+0x5d5/0x1160 net/netlink/genetlink.c:629 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:654 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2477 genl_rcv+0x23/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x444/0x640 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x75d/0xc40 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:657 ___sys_sendmsg+0x658/0x980 net/socket.c:2311 __sys_sendmsg+0xd9/0x180 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2363 do_syscall_64+0xd6/0x550 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577c9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff25da48c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577c9 RDX: 0000000000000080 RSI: 0000000020001e40 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff25da496d4 R13: 00000000004c42db R14: 00000000004d7220 R15: 00000000ffffffff BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor0/7448 caller is dst_cache_set_ip4+0x97/0x2dc net/core/dst_cache.c:98 CPU: 0 PID: 7448 Comm: syz-executor0 Not tainted 5.3.0-rc4+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 check_preemption_disabled lib/smp_processor_id.c:47 [inline] debug_smp_processor_id.cold.2+0x84/0x97 lib/smp_processor_id.c:57 dst_cache_set_ip4+0x97/0x2dc net/core/dst_cache.c:98 tipc_udp_xmit.isra.15+0x7c2/0xc60 net/tipc/udp_media.c:182 tipc_udp_send_msg+0x229/0x3d0 net/tipc/udp_media.c:254 tipc_bearer_xmit_skb+0x12c/0x290 net/tipc/bearer.c:503 tipc_enable_bearer+0x7a6/0xab0 net/tipc/bearer.c:328 __tipc_nl_bearer_enable+0x265/0x390 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x1d/0x30 net/tipc/bearer.c:907 genl_family_rcv_msg+0x5d5/0x1160 net/netlink/genetlink.c:629 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:654 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2477 genl_rcv+0x23/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x444/0x640 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x75d/0xc40 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:657 ___sys_sendmsg+0x658/0x980 net/socket.c:2311 __sys_sendmsg+0xd9/0x180 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2363 do_syscall_64+0xd6/0x550 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577c9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff25da48c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577c9 RDX: 0000000000000080 RSI: 0000000020001e40 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff25da496d4 R13: 00000000004c42db R14: 00000000004d7220 R15: 00000000ffffffff Enabled bearer , priority 10 Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Started in network mode Own node identity ac14142, cluster identity 4711 New replicast peer: 0.0.0.0 BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor5/7502 caller is dst_cache_get+0x33/0xa0 net/core/dst_cache.c:68 32-bit node address hash set to 201414ac CPU: 0 PID: 7502 Comm: syz-executor5 Not tainted 5.3.0-rc4+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 check_preemption_disabled lib/smp_processor_id.c:47 [inline] debug_smp_processor_id.cold.2+0x84/0x97 lib/smp_processor_id.c:57 dst_cache_get+0x33/0xa0 net/core/dst_cache.c:68 tipc_udp_xmit.isra.15+0xb9/0xc60 net/tipc/udp_media.c:164 tipc_udp_send_msg+0x229/0x3d0 net/tipc/udp_media.c:254 tipc_bearer_xmit_skb+0x12c/0x290 net/tipc/bearer.c:503 tipc_enable_bearer+0x7a6/0xab0 net/tipc/bearer.c:328 __tipc_nl_bearer_enable+0x265/0x390 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x1d/0x30 net/tipc/bearer.c:907 genl_family_rcv_msg+0x5d5/0x1160 net/netlink/genetlink.c:629 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:654 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2477 genl_rcv+0x23/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x444/0x640 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x75d/0xc40 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:657 ___sys_sendmsg+0x658/0x980 net/socket.c:2311 __sys_sendmsg+0xd9/0x180 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2363 do_syscall_64+0xd6/0x550 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577c9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe637b3ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577c9 RDX: 0000000000000080 RSI: 0000000020001e40 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe637b3f6d4 R13: 00000000004c42db R14: 00000000004d7220 R15: 00000000ffffffff BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor5/7502 caller is dst_cache_set_ip4+0x97/0x2dc net/core/dst_cache.c:98 CPU: 1 PID: 7502 Comm: syz-executor5 Not tainted 5.3.0-rc4+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 check_preemption_disabled lib/smp_processor_id.c:47 [inline] debug_smp_processor_id.cold.2+0x84/0x97 lib/smp_processor_id.c:57 dst_cache_set_ip4+0x97/0x2dc net/core/dst_cache.c:98 tipc_udp_xmit.isra.15+0x7c2/0xc60 net/tipc/udp_media.c:182 tipc_udp_send_msg+0x229/0x3d0 net/tipc/udp_media.c:254 tipc_bearer_xmit_skb+0x12c/0x290 net/tipc/bearer.c:503 tipc_enable_bearer+0x7a6/0xab0 net/tipc/bearer.c:328 __tipc_nl_bearer_enable+0x265/0x390 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x1d/0x30 net/tipc/bearer.c:907 genl_family_rcv_msg+0x5d5/0x1160 net/netlink/genetlink.c:629 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:654 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2477 genl_rcv+0x23/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x444/0x640 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x75d/0xc40 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:657 ___sys_sendmsg+0x658/0x980 net/socket.c:2311 __sys_sendmsg+0xd9/0x180 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2363 do_syscall_64+0xd6/0x550 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577c9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe637b3ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577c9 RDX: 0000000000000080 RSI: 0000000020001e40 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe637b3f6d4 R13: 00000000004c42db R14: 00000000004d7220 R15: 00000000ffffffff Enabled bearer , priority 10 Started in network mode Own node identity ac14142, cluster identity 4711 New replicast peer: 0.0.0.0 BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor1/7506 caller is dst_cache_get+0x33/0xa0 net/core/dst_cache.c:68 CPU: 0 PID: 7506 Comm: syz-executor1 Not tainted 5.3.0-rc4+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 check_preemption_disabled lib/smp_processor_id.c:47 [inline] debug_smp_processor_id.cold.2+0x84/0x97 lib/smp_processor_id.c:57 dst_cache_get+0x33/0xa0 net/core/dst_cache.c:68 tipc_udp_xmit.isra.15+0xb9/0xc60 net/tipc/udp_media.c:164 tipc_udp_send_msg+0x229/0x3d0 net/tipc/udp_media.c:254 tipc_bearer_xmit_skb+0x12c/0x290 net/tipc/bearer.c:503 tipc_enable_bearer+0x7a6/0xab0 net/tipc/bearer.c:328 __tipc_nl_bearer_enable+0x265/0x390 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x1d/0x30 net/tipc/bearer.c:907 genl_family_rcv_msg+0x5d5/0x1160 net/netlink/genetlink.c:629 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:654 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2477 genl_rcv+0x23/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x444/0x640 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x75d/0xc40 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:657 ___sys_sendmsg+0x658/0x980 net/socket.c:2311 __sys_sendmsg+0xd9/0x180 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2363 do_syscall_64+0xd6/0x550 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577c9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff85061fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577c9 RDX: 0000000000000080 RSI: 0000000020001e40 RDI: 0000000000000004 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff8506206d4 R13: 00000000004c42db R14: 00000000004d7220 R15: 00000000ffffffff BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor1/7506 32-bit node address hash set to 201414ac caller is dst_cache_set_ip4+0x97/0x2dc net/core/dst_cache.c:98 CPU: 1 PID: 7506 Comm: syz-executor1 Not tainted 5.3.0-rc4+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 check_preemption_disabled lib/smp_processor_id.c:47 [inline] debug_smp_processor_id.cold.2+0x84/0x97 lib/smp_processor_id.c:57 dst_cache_set_ip4+0x97/0x2dc net/core/dst_cache.c:98 tipc_udp_xmit.isra.15+0x7c2/0xc60 net/tipc/udp_media.c:182 tipc_udp_send_msg+0x229/0x3d0 net/tipc/udp_media.c:254 tipc_bearer_xmit_skb+0x12c/0x290 net/tipc/bearer.c:503 tipc_enable_bearer+0x7a6/0xab0 net/tipc/bearer.c:328 __tipc_nl_bearer_enable+0x265/0x390 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x1d/0x30 net/tipc/bearer.c:907 genl_family_rcv_msg+0x5d5/0x1160 net/netlink/genetlink.c:629 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:654 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2477 genl_rcv+0x23/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x444/0x640 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x75d/0xc40 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:657 ___sys_sendmsg+0x658/0x980 net/socket.c:2311 __sys_sendmsg+0xd9/0x180 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2363 do_syscall_64+0xd6/0x550 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577c9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff85061fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577c9 RDX: 0000000000000080 RSI: 0000000020001e40 RDI: 0000000000000004 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff8506206d4 R13: 00000000004c42db R14: 00000000004d7220 R15: 00000000ffffffff Enabled bearer , priority 10 Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Started in network mode Own node identity ac14142, cluster identity 4711 New replicast peer: 0.0.0.0 BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor2/7540 caller is dst_cache_get+0x33/0xa0 net/core/dst_cache.c:68 CPU: 1 PID: 7540 Comm: syz-executor2 Not tainted 5.3.0-rc4+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 check_preemption_disabled lib/smp_processor_id.c:47 [inline] debug_smp_processor_id.cold.2+0x84/0x97 lib/smp_processor_id.c:57 dst_cache_get+0x33/0xa0 net/core/dst_cache.c:68 tipc_udp_xmit.isra.15+0xb9/0xc60 net/tipc/udp_media.c:164 tipc_udp_send_msg+0x229/0x3d0 net/tipc/udp_media.c:254 tipc_bearer_xmit_skb+0x12c/0x290 net/tipc/bearer.c:503 tipc_enable_bearer+0x7a6/0xab0 net/tipc/bearer.c:328 __tipc_nl_bearer_enable+0x265/0x390 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x1d/0x30 net/tipc/bearer.c:907 genl_family_rcv_msg+0x5d5/0x1160 net/netlink/genetlink.c:629 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:654 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2477 genl_rcv+0x23/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x444/0x640 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x75d/0xc40 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:657 ___sys_sendmsg+0x658/0x980 net/socket.c:2311 __sys_sendmsg+0xd9/0x180 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2363 do_syscall_64+0xd6/0x550 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577c9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbd056ffc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577c9 RDX: 0000000000000080 RSI: 0000000020001e40 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd057006d4 R13: 00000000004c42db R14: 00000000004d7220 R15: 00000000ffffffff BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor2/7540 caller is dst_cache_set_ip4+0x97/0x2dc net/core/dst_cache.c:98 CPU: 1 PID: 7540 Comm: syz-executor2 Not tainted 5.3.0-rc4+ #1 32-bit node address hash set to 201414ac Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 check_preemption_disabled lib/smp_processor_id.c:47 [inline] debug_smp_processor_id.cold.2+0x84/0x97 lib/smp_processor_id.c:57 dst_cache_set_ip4+0x97/0x2dc net/core/dst_cache.c:98 tipc_udp_xmit.isra.15+0x7c2/0xc60 net/tipc/udp_media.c:182 tipc_udp_send_msg+0x229/0x3d0 net/tipc/udp_media.c:254 tipc_bearer_xmit_skb+0x12c/0x290 net/tipc/bearer.c:503 tipc_enable_bearer+0x7a6/0xab0 net/tipc/bearer.c:328 __tipc_nl_bearer_enable+0x265/0x390 net/tipc/bearer.c:899 tipc_nl_bearer_enable+0x1d/0x30 net/tipc/bearer.c:907 genl_family_rcv_msg+0x5d5/0x1160 net/netlink/genetlink.c:629 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:654 netlink_rcv_skb+0x13f/0x380 net/netlink/af_netlink.c:2477 genl_rcv+0x23/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x444/0x640 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x75d/0xc40 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xe6/0x110 net/socket.c:657 ___sys_sendmsg+0x658/0x980 net/socket.c:2311 __sys_sendmsg+0xd9/0x180 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2363 do_syscall_64+0xd6/0x550 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577c9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbd056ffc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577c9 RDX: 0000000000000080 RSI: 0000000020001e40 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd057006d4 R13: 00000000004c42db R14: 00000000004d7220 R15: 00000000ffffffff ------------[ cut here ]------------ Enabled bearer , priority 10 WARNING: CPU: 1 PID: 16 at include/net/dst.h:228 dst_hold.part.1+0x10/0x14 include/net/dst.h:228