https://bugzilla.kernel.org/show_bug.cgi?id=217581 --- Comment #8 from Mohamed Yassine JEBABLI (mohamed-yassine.jebabli@xxxxxxxxx) --- (In reply to Bagas Sanjaya from comment #6) > On 6/27/23 20:23, bugzilla-daemon@xxxxxxxxxx wrote: > > https://bugzilla.kernel.org/show_bug.cgi?id=217581 > > > > --- Comment #5 from Mohamed Yassine JEBABLI > > (mohamed-yassine.jebabli@xxxxxxxxx) --- > > (In reply to Bagas Sanjaya from comment #4) > >> (In reply to Mohamed Yassine JEBABLI from comment #0) > >>> In reconnect slave mode, I start direct advertising. After establishing > the > >>> connection with the central device, we begin ATT exchanges over the L2CAP > >>> socket, and then I receive a disconnect with L2CAP traces. This issue is > >>> observed across different kernel versions such as 5.17, 6.2, 6.3, 6.3.7, > >> etc. > >>> > >> > >> Do you have this issue on v5.15? > > > > Not tested on v5.15. I started with 5.17 version. > > > > Again: Do you have this issue on v5.15? Tested on kernel v5.15 with l2cap_core traces enabled. ==> The same scenario from reconnecr to disconnect and I think the same bug related to rfcount which goes to NULL in the other versions > v5.15. Jun 28 14:41:36 buildroot kernel: chan 7942e3b3 orig refcnt 1 Jun 28 14:41:36 buildroot kernel: hcon 5a56584a bdaddr 48:b0:2d:02:81:0a status 0 Jun 28 14:41:36 buildroot kernel: hcon 5a56584a conn d7202d29 hchan 981967be Jun 28 14:41:36 buildroot kernel: chan 7942e3b3 orig refcnt 2 Jun 28 14:41:36 buildroot kernel: chan e8221202 Jun 28 14:41:36 buildroot kernel: chan e8221202 orig refcnt 1 Jun 28 14:41:36 buildroot kernel: conn d7202d29, psm 0x00, dcid 0x0004 Jun 28 14:41:36 buildroot kernel: chan e8221202 orig refcnt 2 Jun 28 14:41:36 buildroot kernel: chan e5e549e1 orig refcnt 1 Jun 28 14:41:36 buildroot kernel: chan 7942e3b3 orig refcnt 3 Jun 28 14:41:36 buildroot kernel: chan 05ee00c1 Jun 28 14:41:36 buildroot kernel: conn d7202d29, psm 0x00, dcid 0x0006 Jun 28 14:41:36 buildroot kernel: chan 05ee00c1 orig refcnt 1 Jun 28 14:41:36 buildroot kernel: chan e5e549e1 orig refcnt 2 Jun 28 14:41:36 buildroot kernel: conn d7202d29 Jun 28 14:41:36 buildroot kernel: chan 05ee00c1 len 2 Jun 28 14:41:36 buildroot kernel: chan 05ee00c1, skb 62f90460 len 6 priority 7 Jun 28 14:41:36 buildroot kernel: hci1 conn d7202d29 Jun 28 14:41:36 buildroot kernel: Jun 28 14:41:37 buildroot kernel: hcon 5a56584a reason 19 Jun 28 14:41:37 buildroot kernel: hcon 5a56584a conn d7202d29, err 104 Jun 28 14:41:37 buildroot kernel: chan 05ee00c1 orig refcnt 2 Jun 28 14:41:37 buildroot kernel: chan 05ee00c1, conn d7202d29, err 104, state BT_CONNECTED Jun 28 14:41:37 buildroot kernel: chan 05ee00c1 orig refcnt 3 Jun 28 14:41:37 buildroot kernel: chan 05ee00c1 orig refcnt 2 Jun 28 14:41:37 buildroot kernel: chan 05ee00c1 orig refcnt 1 Jun 28 14:41:37 buildroot kernel: chan 05ee00c1 Jun 28 14:41:37 buildroot kernel: chan e8221202 orig refcnt 3 Jun 28 14:41:37 buildroot kernel: chan e8221202, conn d7202d29, err 104, state BT_OPEN Jun 28 14:41:37 buildroot kernel: chan e8221202 orig refcnt 4 Jun 28 14:41:37 buildroot kernel: chan e8221202 orig refcnt 3 Jun 28 14:41:37 buildroot kernel: chan e8221202 orig refcnt 2 Jun 28 14:41:37 buildroot kernel: chan 7942e3b3 orig refcnt 2 Jun 28 14:41:37 buildroot kernel: chan 7942e3b3 state BT_LISTEN Jun 28 14:41:37 buildroot kernel: chan e8221202 orig refcnt 1 Jun 28 14:41:37 buildroot kernel: chan e8221202 Jun 28 14:41:37 buildroot kernel: chan e8221202 orig refcnt 0 Jun 28 14:41:37 buildroot kernel: ------------[ cut here ]------------ Jun 28 14:41:37 buildroot kernel: WARNING: CPU: 1 PID: 476 at lib/refcount.c:25 l2cap_sock_teardown_cb+0x13c/0x23c Jun 28 14:41:37 buildroot kernel: refcount_t: addition on 0; use-after-free. Jun 28 14:41:37 buildroot kernel: Modules linked in: algif_hash algif_skcipher af_alg stm32_adc stm32_timer_trigger stm32_lptimer_trigger galcore(O) stm32_crc32 stm32_cryp stm32_hash libdes crypto_engine stm32_adc_core stm32_cec Jun 28 14:41:37 buildroot kernel: CPU: 1 PID: 476 Comm: HCIManager Tainted: G O 5.15.67 #2 Jun 28 14:41:37 buildroot kernel: Hardware name: STM32 (Device Tree Support) Jun 28 14:41:37 buildroot kernel: [<c0110c54>] (unwind_backtrace) from [<c010c61c>] (show_stack+0x10/0x14) Jun 28 14:41:37 buildroot kernel: [<c010c61c>] (show_stack) from [<c0ca2f50>] (dump_stack_lvl+0x40/0x4c) Jun 28 14:41:37 buildroot kernel: [<c0ca2f50>] (dump_stack_lvl) from [<c0120fc0>] (__warn+0xec/0x104) Jun 28 14:41:37 buildroot kernel: [<c0120fc0>] (__warn) from [<c0c9e214>] (warn_slowpath_fmt+0x98/0xc4) Jun 28 14:41:37 buildroot kernel: [<c0c9e214>] (warn_slowpath_fmt) from [<c0b67748>] (l2cap_sock_teardown_cb+0x13c/0x23c) Jun 28 14:41:37 buildroot kernel: [<c0b67748>] (l2cap_sock_teardown_cb) from [<c0b5f584>] (l2cap_chan_close+0x138/0x2f4) Jun 28 14:41:37 buildroot kernel: [<c0b5f584>] (l2cap_chan_close) from [<c0b67a60>] (l2cap_sock_shutdown+0x218/0x5ac) Jun 28 14:41:37 buildroot kernel: [<c0b67a60>] (l2cap_sock_shutdown) from [<c0b67e44>] (l2cap_sock_release+0x50/0xe8) Jun 28 14:41:37 buildroot kernel: [<c0b67e44>] (l2cap_sock_release) from [<c09b7f10>] (__sock_release+0x40/0xb8) Jun 28 14:41:37 buildroot kernel: [<c09b7f10>] (__sock_release) from [<c09b7f98>] (sock_close+0x10/0x18) Jun 28 14:41:37 buildroot kernel: [<c09b7f98>] (sock_close) from [<c02a6e84>] (__fput+0x74/0x240) Jun 28 14:41:37 buildroot kernel: [<c02a6e84>] (__fput) from [<c0141ac0>] (task_work_run+0x90/0xbc) Jun 28 14:41:37 buildroot kernel: [<c0141ac0>] (task_work_run) from [<c010c048>] (do_work_pending+0x498/0x594) Jun 28 14:41:37 buildroot kernel: [<c010c048>] (do_work_pending) from [<c01000c0>] (slow_work_pending+0xc/0x20) Jun 28 14:41:37 buildroot kernel: Exception stack(0xc3fe1fb0 to 0xc3fe1ff8) Jun 28 14:41:37 buildroot kernel: 1fa0: 00000000 00000002 00000000 00000000 Jun 28 14:41:37 buildroot kernel: 1fc0: 00000006 b4dfd8c0 00000005 00000006 b4dfd400 b4dfd470 00000000 b4dfcb7c Jun 28 14:41:37 buildroot kernel: 1fe0: 00000006 b4dfcb58 b6b96bf9 b6b98b26 80030030 00000006 Jun 28 14:41:37 buildroot kernel: ---[ end trace b1ffe2b440acbd97 ]--- Jun 28 14:41:37 buildroot kernel: chan e8221202 state BT_OPEN Jun 28 14:41:37 buildroot kernel: chan e8221202 orig refcnt 3221225472 Jun 28 14:41:37 buildroot kernel: ------------[ cut here ]------------ Jun 28 14:41:37 buildroot kernel: WARNING: CPU: 1 PID: 476 at lib/refcount.c:28 l2cap_sock_kill.part.0+0x28/0xc0 Jun 28 14:41:37 buildroot kernel: refcount_t: underflow; use-after-free. Jun 28 14:41:37 buildroot kernel: Modules linked in: algif_hash algif_skcipher af_alg stm32_adc stm32_timer_trigger stm32_lptimer_trigger galcore(O) stm32_crc32 stm32_cryp stm32_hash libdes crypto_engine stm32_adc_core stm32_cec Jun 28 14:41:37 buildroot kernel: CPU: 1 PID: 476 Comm: HCIManager Tainted: G W O 5.15.67 #2 Jun 28 14:41:37 buildroot kernel: Hardware name: STM32 (Device Tree Support) Jun 28 14:41:37 buildroot kernel: [<c0110c54>] (unwind_backtrace) from [<c010c61c>] (show_stack+0x10/0x14) Jun 28 14:41:37 buildroot kernel: [<c010c61c>] (show_stack) from [<c0ca2f50>] (dump_stack_lvl+0x40/0x4c) Jun 28 14:41:37 buildroot kernel: [<c0ca2f50>] (dump_stack_lvl) from [<c0120fc0>] (__warn+0xec/0x104) Jun 28 14:41:37 buildroot kernel: [<c0120fc0>] (__warn) from [<c0c9e214>] (warn_slowpath_fmt+0x98/0xc4) Jun 28 14:41:37 buildroot kernel: [<c0c9e214>] (warn_slowpath_fmt) from [<c0b6754c>] (l2cap_sock_kill.part.0+0x28/0xc0) Jun 28 14:41:37 buildroot kernel: [<c0b6754c>] (l2cap_sock_kill.part.0) from [<c0b67708>] (l2cap_sock_teardown_cb+0xfc/0x23c) Jun 28 14:41:37 buildroot kernel: [<c0b67708>] (l2cap_sock_teardown_cb) from [<c0b5f584>] (l2cap_chan_close+0x138/0x2f4) Jun 28 14:41:37 buildroot kernel: [<c0b5f584>] (l2cap_chan_close) from [<c0b67a60>] (l2cap_sock_shutdown+0x218/0x5ac) Jun 28 14:41:37 buildroot kernel: [<c0b67a60>] (l2cap_sock_shutdown) from [<c0b67e44>] (l2cap_sock_release+0x50/0xe8) Jun 28 14:41:37 buildroot kernel: [<c0b67e44>] (l2cap_sock_release) from [<c09b7f10>] (__sock_release+0x40/0xb8) Jun 28 14:41:37 buildroot kernel: [<c09b7f10>] (__sock_release) from [<c09b7f98>] (sock_close+0x10/0x18) Jun 28 14:41:37 buildroot kernel: [<c09b7f98>] (sock_close) from [<c02a6e84>] (__fput+0x74/0x240) Jun 28 14:41:37 buildroot kernel: [<c02a6e84>] (__fput) from [<c0141ac0>] (task_work_run+0x90/0xbc) Jun 28 14:41:37 buildroot kernel: [<c0141ac0>] (task_work_run) from [<c010c048>] (do_work_pending+0x498/0x594) Jun 28 14:41:37 buildroot kernel: [<c010c048>] (do_work_pending) from [<c01000c0>] (slow_work_pending+0xc/0x20) Jun 28 14:41:37 buildroot kernel: Exception stack(0xc3fe1fb0 to 0xc3fe1ff8) Jun 28 14:41:37 buildroot kernel: 1fa0: 00000000 00000002 00000000 00000000 Jun 28 14:41:37 buildroot kernel: 1fc0: 00000006 b4dfd8c0 00000005 00000006 b4dfd400 b4dfd470 00000000 b4dfcb7c Jun 28 14:41:37 buildroot kernel: 1fe0: 00000006 b4dfcb58 b6b96bf9 b6b98b26 80030030 00000006 Jun 28 14:41:37 buildroot kernel: ---[ end trace b1ffe2b440acbd98 ]--- Jun 28 14:41:37 buildroot kernel: chan e8221202 orig refcnt 3221225472 Jun 28 14:41:37 buildroot kernel: chan 7942e3b3 orig refcnt 3 Jun 28 14:41:37 buildroot kernel: chan 7942e3b3 orig refcnt 2 Jun 28 14:41:37 buildroot kernel: chan 7942e3b3 orig refcnt 3 Jun 28 14:41:37 buildroot kernel: chan 7942e3b3 orig refcnt 2 Jun 28 14:41:37 buildroot kernel: chan 7942e3b3 orig refcnt 1 Jun 28 14:41:37 buildroot kernel: chan 7942e3b3 -- You may reply to this email to add a comment. 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