Hello all, Am Dienstag, 17. März 2026, 17:19:11 Mitteleuropäische Normalzeit schrieb Pedro Falcato: > +Cc a bunch of relevant people > > On Mon, Mar 16, 2026 at 09:18:37AM +0100, Benjamin Eikel wrote: > > Dear Linux kernel developers, > > > > I have reported this issue as Debian bug #1130138 [1], which has been > > marked “upstream”. I am therefore also reaching out here to make you > > aware of it. Please let me know if you need additional information. > > > > After upgrading from linux-image-6.18.15+deb14-amd64, I see this error > > several times and the system shortly freezes. It seems related to Zoom > > crashing first, but the freezes were not noticable with older Linux > > kernels. > > Do you have a simpler repro you can share? unfortunately, no. I tried killing some programs to simulate a non-proper shutdown, but that did not trigger the behavior. Currently, I am not even able to reproduce the issue with the Zoom Linux client. So, it's probably best to treat this as “cannot reproduce.” If I find a way to reproduce the problem, I will try v7.0-rc4 first to see if it still occurs. If so, I will report it. > > > Currently booted into 6.18.15+deb14-amd64 which does not exhibit this > > issue. The stalls occurred when running 6.19.6+deb14-amd64. More > > information about my system can be found in the Debian bug report. > > Can you attach the debian kernel config? Is it possible something relevant > changed since 6.18? FWIW I've attached the config files from /boot. Thanks for your reply Benjamin > > > Mär 09 09:13:48 thinkpad-benjamin kernel: rcu: INFO: rcu_preempt detected > > stalls on CPUs/tasks: > > Mär 09 09:13:48 thinkpad-benjamin kernel: rcu: Tasks blocked on > > level-0 rcu_node (CPUs 0-15): P10008/1:b..l > > Mär 09 09:13:48 thinkpad-benjamin kernel: rcu: (detected by 5, > > t=5252 jiffies, g=177537, q=28067 ncpus=16) > > Mär 09 09:13:48 thinkpad-benjamin kernel: task:zoom state:R > > running task stack:0 pid:10008 tgid:10008 ppid:2089 > > task_flags:0x40040c flags:0x00080802 > > Mär 09 09:13:48 thinkpad-benjamin kernel: Call Trace: > > Mär 09 09:13:48 thinkpad-benjamin kernel: > > Mär 09 09:13:48 thinkpad-benjamin kernel: __schedule+0x48a/0xfc0 > > Mär 09 09:13:48 thinkpad-benjamin kernel: preempt_schedule+0x32/0x50 > > Mär 09 09:13:48 thinkpad-benjamin kernel: > > preempt_schedule_thunk+0x16/0x30 > > Mär 09 09:13:48 thinkpad-benjamin kernel: _raw_spin_unlock+0x22/0x30 > > Mär 09 09:13:48 thinkpad-benjamin kernel: unmap_page_range+0xbcb/0x1700 > > Hmm. We have a bunch of cond_resched() sprayed around this code. This > _should_ work. I don't see anything particularly interesting that changed > between 6.18 and 6.19. > > > Mär 09 09:13:48 thinkpad-benjamin kernel: unmap_vmas+0xa1/0x180 > > Mär 09 09:13:48 thinkpad-benjamin kernel: exit_mmap+0xe1/0x3b0 > > Mär 09 09:13:48 thinkpad-benjamin kernel: __mmput+0x41/0x150 > > Mär 09 09:13:48 thinkpad-benjamin kernel: do_exit+0x251/0xa70 > > Mär 09 09:13:48 thinkpad-benjamin kernel: do_group_exit+0x2d/0xc0 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:13:48 thinkpad-benjamin kernel: get_signal+0x8a4/0x920 > > Mär 09 09:13:48 thinkpad-benjamin kernel: > > arch_do_signal_or_restart+0x40/0x250 > > Mär 09 09:13:48 thinkpad-benjamin kernel: > > exit_to_user_mode_loop+0x8e/0x480 Mär 09 09:13:48 thinkpad-benjamin > > kernel: ? __x64_sys_sched_setaffinity+0x6a/ 0xb0 > > Mär 09 09:13:48 thinkpad-benjamin kernel: do_syscall_64+0x20b/0x600 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? ksys_read+0xcd/0xf0 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? do_syscall_64+0xbe/0x600 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? do_syscall_64+0xbe/0x600 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? __x64_sys_close+0x3d/0x80 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? do_syscall_64+0xbe/0x600 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:13:48 thinkpad-benjamin kernel: ? exc_page_fault+0x7e/0x1a0 > > Mär 09 09:13:48 thinkpad-benjamin kernel: > > entry_SYSCALL_64_after_hwframe+0x76/0x7e > > Mär 09 09:13:48 thinkpad-benjamin kernel: RIP: 0033:0x7f2876359e2d > > Mär 09 09:13:48 thinkpad-benjamin kernel: RSP: 002b:00007ffc91243ad8 > > EFLAGS: 00000246 ORIG_RAX: 00000000000000cb > > Mär 09 09:13:48 thinkpad-benjamin kernel: RAX: 0000000000000000 RBX: > > 00007f2875207700 RCX: 00007f2876359e2d > > Mär 09 09:13:48 thinkpad-benjamin kernel: RDX: 00007ffc91243ae0 RSI: > > 0000000000000080 RDI: 0000000000002718 > > Mär 09 09:13:48 thinkpad-benjamin kernel: RBP: 0000000000000020 R08: > > 0000000000000001 R09: 00007f2875206de8 > > Mär 09 09:13:48 thinkpad-benjamin kernel: R10: 0000000000000000 R11: > > 0000000000000246 R12: 00007ffc91243ae0 > > Mär 09 09:13:48 thinkpad-benjamin kernel: R13: 00007ffc91243c80 R14: > > 0000000000000000 R15: 0000000000000020 > > Mär 09 09:13:48 thinkpad-benjamin kernel: > > Mär 09 09:13:48 thinkpad-benjamin kernel: rcu: INFO: rcu_preempt detected > > expedited stalls on CPUs/tasks: { P10008 } 5361 jiffies s: 1609 root: > > 0x0/T > > Mär 09 09:13:48 thinkpad-benjamin kernel: rcu: blocking rcu_node > > structures > > (internal RCU debug): > > > > Another one: > > > > Mär 09 09:14:51 thinkpad-benjamin kernel: rcu: INFO: rcu_preempt detected > > stalls on CPUs/tasks: > > Mär 09 09:14:51 thinkpad-benjamin kernel: rcu: Tasks blocked on > > level-0 rcu_node (CPUs 0-15): P10008/1:b..l > > Mär 09 09:14:51 thinkpad-benjamin kernel: rcu: (detected by 5, > > t=21007 jiffies, g=177537, q=87903 ncpus=16) > > Mär 09 09:14:51 thinkpad-benjamin kernel: task:zoom state:R > > running task stack:0 pid:10008 tgid:10008 ppid:2089 > > task_flags:0x40040c flags:0x00080802 > > Mär 09 09:14:51 thinkpad-benjamin kernel: Call Trace: > > Mär 09 09:14:51 thinkpad-benjamin kernel: > > Mär 09 09:14:51 thinkpad-benjamin kernel: __schedule+0x48a/0xfc0 > > Mär 09 09:14:51 thinkpad-benjamin kernel: preempt_schedule+0x32/0x50 > > Mär 09 09:14:51 thinkpad-benjamin kernel: > > preempt_schedule_thunk+0x16/0x30 > > Mär 09 09:14:51 thinkpad-benjamin kernel: _raw_spin_unlock+0x22/0x30 > > Mär 09 09:14:51 thinkpad-benjamin kernel: unmap_page_range+0xbcb/0x1700 > > Mär 09 09:14:51 thinkpad-benjamin kernel: unmap_vmas+0xa1/0x180 > > Mär 09 09:14:51 thinkpad-benjamin kernel: exit_mmap+0xe1/0x3b0 > > Mär 09 09:14:51 thinkpad-benjamin kernel: __mmput+0x41/0x150 > > Mär 09 09:14:51 thinkpad-benjamin kernel: do_exit+0x251/0xa70 > > Mär 09 09:14:51 thinkpad-benjamin kernel: do_group_exit+0x2d/0xc0 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:14:51 thinkpad-benjamin kernel: get_signal+0x8a4/0x920 > > Mär 09 09:14:51 thinkpad-benjamin kernel: > > arch_do_signal_or_restart+0x40/0x250 > > Mär 09 09:14:51 thinkpad-benjamin kernel: > > exit_to_user_mode_loop+0x8e/0x480 Mär 09 09:14:51 thinkpad-benjamin > > kernel: ? __x64_sys_sched_setaffinity+0x6a/ 0xb0 > > Mär 09 09:14:51 thinkpad-benjamin kernel: do_syscall_64+0x20b/0x600 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? ksys_read+0xcd/0xf0 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? do_syscall_64+0xbe/0x600 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? do_syscall_64+0xbe/0x600 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? __x64_sys_close+0x3d/0x80 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? do_syscall_64+0xbe/0x600 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? > > srso_alias_return_thunk+0x5/0xfbef5 > > Mär 09 09:14:51 thinkpad-benjamin kernel: ? exc_page_fault+0x7e/0x1a0 > > Mär 09 09:14:51 thinkpad-benjamin kernel: > > entry_SYSCALL_64_after_hwframe+0x76/0x7e > > Mär 09 09:14:51 thinkpad-benjamin kernel: RIP: 0033:0x7f2876359e2d > > Mär 09 09:14:51 thinkpad-benjamin kernel: RSP: 002b:00007ffc91243ad8 > > EFLAGS: 00000246 ORIG_RAX: 00000000000000cb > > Mär 09 09:14:51 thinkpad-benjamin kernel: RAX: 0000000000000000 RBX: > > 00007f2875207700 RCX: 00007f2876359e2d > > Mär 09 09:14:51 thinkpad-benjamin kernel: RDX: 00007ffc91243ae0 RSI: > > 0000000000000080 RDI: 0000000000002718 > > Mär 09 09:14:51 thinkpad-benjamin kernel: RBP: 0000000000000020 R08: > > 0000000000000001 R09: 00007f2875206de8 > > Mär 09 09:14:51 thinkpad-benjamin kernel: R10: 0000000000000000 R11: > > 0000000000000246 R12: 00007ffc91243ae0 > > Mär 09 09:14:51 thinkpad-benjamin kernel: R13: 00007ffc91243c80 R14: > > 0000000000000000 R15: 0000000000000020 > > Mär 09 09:14:51 thinkpad-benjamin kernel: > > Mär 09 09:14:52 thinkpad-benjamin kernel: rcu: INFO: rcu_preempt detected > > expedited stalls on CPUs/tasks: { P10008 } 21233 jiffies s: 1609 root: > > 0x0/T Mär 09 09:14:52 thinkpad-benjamin kernel: rcu: blocking rcu_node > > structures (internal RCU debug): > > > > Note the stall duration escalating from t=5252 jiffies (~5s) to t=21007 > > jiffies (~21s), with the same grace period (g=177537), indicating the > > unmap_page_range operation blocked for over a minute. > > > > Kind regards > > Benjamin > > > > [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1130138