Public bug reported: SRU Justification: ------------------
Impact: ------- Kernel crash upon shutdown or rebooting the device. Test case: ---------- 1) Power up the device, Redpine modules are loaded by default. 2) Reboot or shutdown the device. 3) Observe the behavior. Result: ------- Redpine driver crashes the entire kernel and below is the crash log. ... skipping ... [ 47.002030] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 [ 47.010828] IP: rsi_shutdown+0x2c/0x100 [rsi_sdio] [ 47.016180] PGD 0 P4D 0 [ 47.019025] Oops: 0000 1 SMP PTI [ 47.136275] CPU: 1 PID: 1 Comm: systemd-shutdow Not tainted 4.15.0-1035-oem #40-Ubuntu [ 47.145131] Hardware name: Dell Inc. Edge Gateway 3001/0YMHCG, BIOS 01.00.08 10/23/2018 [ 47.154096] RIP: 0010:rsi_shutdown+0x2c/0x100 [rsi_sdio] [ 47.160039] RSP: 0018:ffffb08d0000bd78 EFLAGS: 00010246 [ 47.165887] RAX: 0000000000000000 RBX: ffffa08b77f1d000 RCX: 0000000000000000 [ 47.173869] RDX: 0000000000000002 RSI: ffffffffc07aa77f RDI: 0000000000000001 [ 47.181851] RBP: ffffb08d0000bd90 R08: 0000000000000000 R09: ffffb08d0000bc50 [ 47.189834] R10: 0000000000000000 R11: 000000000000023a R12: ffffa08b6d940000 [ 47.197816] R13: ffffa08b3cbfb408 R14: ffffffff8f556137 R15: ffffa08b3cbfb468 [ 47.205801] FS: 00007f85cd093940(0000) GS:ffffa08b70b00000(0000) knlGS:0000000000000000 [ 47.214854] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.221281] CR2: 0000000000000038 CR3: 000000006a930000 CR4: 00000000001006e0 [ 47.229262] Call Trace: [ 47.232017] device_shutdown+0x14e/0x200 [ 47.236416] kernel_power_off+0x35/0x70 [ 47.240711] SYSC_reboot+0x132/0x210 [ 47.244721] ? SYSC_rt_sigtimedwait+0x88/0xe0 [ 47.249604] ? do_writev+0x61/0xf0 [ 47.253411] ? do_writev+0x61/0xf0 [ 47.257219] ? sigprocmask+0x6f/0xa0 [ 47.261225] SyS_reboot+0xe/0x10 [ 47.264841] do_syscall_64+0x73/0x130 [ 47.268945] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Root cause analysis: -------------------- Device operating mode 8(bluetooth alone), our driver supports multiple modes like 13(WiFi + Bluetooth), WiFi related structures are not been initialized in Bluetooth alone mode(8), dereferencing them in rsi_shutdown function causes crash. In Redpine driver, this NULL check is missed. Hence, Added the fix for the same. Fix: ---- Added proper NULL check in rsi_shutdown function. Regression Potential: --------------------- This is a very direct issue, since the driver is getting crashed while reboot. We rebooted multiples times, checked the driver stability. Every thing ran smooth. ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete ** Tags: bionic verification-done-bionic ** Patch added: "This patch fixes the crash" https://bugs.launchpad.net/bugs/1836215/+attachment/5276506/+files/0001-rsi-system-crashed-while-reboot-shutdown.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1836215 Title: [DELL][BIONICS][RSI] Redpine driver got crashed during shutdown/reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1836215/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs