https://bugzilla.kernel.org/show_bug.cgi?id=207873
Bug ID: 207873 Summary: BUG at swapops + rcu stall + soft lockup at running btrfs test suite (TEST=013\* ./misc-tests.sh) Product: Platform Specific/Hardware Version: 2.5 Kernel Version: 5.7-rc6 Hardware: PPC-32 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: PPC-32 Assignee: platform_ppc...@kernel-bugs.osdl.org Reporter: erhar...@mailbox.org CC: fs_bt...@kernel-bugs.osdl.org Regression: No Created attachment 289253 --> https://bugzilla.kernel.org/attachment.cgi?id=289253&action=edit kernel .config (5.7-rc6, PowerMac G4 DP) The bug is triggered by running "TEST=013\* ./misc-tests.sh" of btrfs-progs test suite, built from git master: # git clone https://github.com/kdave/btrfs-progs && cd btrfs-progs/ # ./autogen.sh && ./configure --disable-documentation # make && make fssum # cd tests/ # TEST=013\* ./misc-tests.sh The G4 crashes and the reboot timer kicks in. Before it shows a series of stack traces, starting with the "kernel BUG at include/linux/swapops.h:197!"-part from bug #207221. After that I get an rcu stall and a soft lockup. For the full stacktrace have a look at the transcript of both screenshots. [...] rcu: INFO: rcu_sched self-detected stall on CPU rcu: o1-....: (7799 ticks this GP) idle=a06/1/0x40000002 soft irq=11075/11075 fqs=2599 o(t=7804 jiffies g=21629 q=59) Task dump for CPU 1: dd R running task 0 2200 394 0x0000000c Call Trace: [f49fb458] [c00fcddc] sched_show_task+0x3bc/Ox3fe (unreliable) [f49fb498] [c01c650c] rcu_dump_cpu_stacks+0x228/0x23c [f49fb4e8] [c01c2e18] rcu_sched_clock_irq+0x81c/0x1360 [f49fb568] [c01d8940] update_process_times+0x2c/0x98 [f49fb588] [c02027d4] tick_sched_timer+0x128/0x1d8 [f49fb5a8] [c01dc49c] __hrtimer_run_queues+0x490/Oxae8 [f49fb698] [c01dd788] hrtimer_interrupt+0x278/0x520 [f49fb6f8] [c001710c] timer_interrupt+0x374/0xb4c [f49fb738] [c002c5e4] ret_from_except+0x0/0x14 --- interrupt: 901 at do_raw_spin_lock+0x1c8/0x2cc LR = do_raw_spin_lock+0x1a4/0x2cc [f49fb800] [c0180e0c] do_raw_spin_lock+0x188/0x2cc (unrelable) [f49fb830] [c0428890] unmap_page_range+0x244/0xb08 [f49fb910] [c0429610] unmap_vmas+0x94/0xdc [f49fb930] [c043c25c] exit_mmap+0x340/0x46c [f49fba20] [c0078260] __mmput+0x78/0x360 [f49fba50] [c0090514] do_exit+0x9c4/0x21fc [f49fbb20] [c0019d38] user_single_step_report+0x0/0x74 [f49fbb70] [c002c5e0] ret_from_except+0x0/0x4 --- interrupt: 700 at __migration_entry_wait+0x13c/0x198 LR = __migration_entry_wait+0xf0/0x198 [f49fbc58] [c042c0f0] do_swap_page+0x1f0/0x198 [f49fbd28] [c042e7e4] handle_mm_fault+0x794/0x16f4 [f49fbe48] [c0039868] do_page_fault+0xf50/0x12f8 [f49fbf38] [c002c468] handle_page_fault+0x10/0x3c --- interrupt: 301 at 0x87e378 LR = 0x87e33c [...] I don't know wether this is a btrfs bug, or a bug only triggered by this specific test. So I am filing this as platform specific as I have not seen it on x86 yet. Unlike bug #207221 KASAN is enabled here, so the stack trace looks slightly different. -- You are receiving this mail because: You are watching the assignee of the bug.