BUG: "hc->tx_t_ipi == NUM" holds (exception!) at net/dccp/ccids/ccid3.c:LINE/ccid3_update_send_interval()

Status: upstream: reported C repro on 2025/02/18 06:45
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+706482fd412e86d6ee37@syzkaller.appspotmail.com
First crash: 520d, last: 15d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2025/03/21 upstream (ToT) b3ee1e460951 C [report] BUG: "hc->tx_t_ipi == NUM" holds (exception!) at net/dccp/ccids/ccid3.c:LINE/ccid3_update_send_interval()
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 BUG: "hc->tx_t_ipi == NUM" holds (exception!) at net/dccp/ccids/ccid3.c:LINE/ccid3_update_send_interval() -1 C 3 1249d 1623d 0/1 upstream: reported C repro on 2022/02/11 04:42
upstream BUG: "hc->tx_t_ipi == NUM" holds (exception!) at net/dccp/ccids/ccid3.c:LINE/ccid3_update_send_interval() net -1 C inconclusive error 64 415d 1655d 0/29 auto-obsoleted due to no activity on 2025/09/11 13:42
linux-4.19 BUG: "hc->tx_t_ipi == NUM" holds (exception!) at net/dccp/ccids/ccid3.c:LINE/ccid3_update_send_interval() -1 C error 14 1250d 1643d 0/1 upstream: reported C repro on 2022/01/22 17:14
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2026/07/08 19:57 16m retest repro linux-5.15.y report log
2026/03/30 15:38 11m retest repro linux-5.15.y report log
2026/01/19 14:45 10m retest repro linux-5.15.y report log
2025/11/08 20:27 11m retest repro linux-5.15.y report log
2025/08/30 14:02 11m retest repro linux-5.15.y report log
2025/06/18 03:34 13m retest repro linux-5.15.y report log
2025/03/04 14:50 13m retest repro linux-5.15.y report log

Sample crash report:
dccp_xmit_packet: Payload too large (65475) for featneg.
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval()
CPU: 0 PID: 4020 Comm: syz-executor360 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline]
 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline]
 ccid3_hc_tx_packet_sent+0x250/0x2bc net/dccp/ccids/ccid3.c:353
 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline]
 dccp_xmit_packet+0x298/0x448 net/dccp/output.c:289
 dccp_write_xmit+0x128/0x208 net/dccp/output.c:366
 dccp_sendmsg+0x608/0xae0 net/dccp/proto.c:810
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/18 06:44 linux-5.15.y c16c81c81336 429ea007 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 BUG: "hc->tx_t_ipi == NUM" holds (exception!) at net/dccp/ccids/ccid3.c:LINE/ccid3_update_send_interval()
* Struck through repros no longer work on HEAD.