linux-kernel - BUG: spinlock trylock failure on UP on CPU#0, Xvnc/256

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Date:   Sun, 18 Dec 2022 23:52:11 +0100
From:   "Erhard F." <erhard_f@...lbox.org>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org
Subject: BUG: spinlock trylock failure on UP on CPU#0, Xvnc/256

Same for 6.1.0 on my PowerMac G4 DP:

[...]
BUG: spinlock trylock failure on UP on CPU#0, Xvnc/260
 lock: 0xc40aa008, .magic: dead4ead, .owner: Xvnc/260, .owner_cpu: 0
CPU: 0 PID: 260 Comm: Xvnc Tainted: G                T  6.1.0-gentoo-PMacG4 #1
Hardware name: PowerMac3,6 7455 0x80010303 PowerMac
Call Trace:
[f2a65c70] [c091b9a8] dump_stack_lvl+0x34/0x74 (unreliable)
[f2a65c90] [c00902e0] do_raw_spin_trylock+0xac/0xb8
[f2a65cb0] [c0955c0c] _raw_spin_trylock+0x10/0x44
[f2a65cc0] [c02225dc] do_compact_page+0x58/0x9c0
[f2a65d10] [c01fb280] zswap_free_entry+0xd8/0x198
[f2a65d30] [c01fb498] zswap_frontswap_invalidate_page+0xec/0xf0
[f2a65d50] [c01fa638] __frontswap_invalidate_page+0x5c/0xd4
[f2a65d70] [c01f5a68] swapcache_free_entries+0x310/0x478
[f2a65dc0] [c01f9ff4] free_swap_slot+0x138/0x158
[f2a65de0] [c01f56fc] put_swap_folio+0xb8/0x114
[f2a65e00] [c01f229c] delete_from_swap_cache+0x78/0xdc
[f2a65e20] [c01f6128] folio_free_swap+0xf0/0x13c
[f2a65e50] [c01ca618] do_wp_page+0x19c/0x710
[f2a65e80] [c01cc1c0] handle_mm_fault+0x8dc/0xe34
[f2a65f00] [c001eaa0] do_page_fault+0x1c0/0x804
[f2a65f30] [c000433c] DataAccess_virt+0x124/0x17c
--- interrupt: 300 at 0xa7a0bd7c
NIP:  a7a0bd7c LR: a7a02ee4 CTR: a7a0bdec
REGS: f2a65f40 TRAP: 0300   Tainted: G                T   (6.1.0-gentoo-PMacG4)
MSR:  0000f932 <EE,PR,FP,ME,IR,DR,RI>  CR: 24002428  XER: 00000000
DAR: 02607990 DSISR: 0a000000 
GPR00: 00c91904 afb4ac10 a7c86520 02607990 00000018 000000a0 a7af45f0 ff000000 
GPR08: 0260797c 02607990 a6d14000 a7a02d98 a7a02ee4 00d6fff4 afb4c244 afb4c248 
GPR16: 00d74474 00d7424c 00d74470 00d74248 00d7446c 00000000 a7c7f6e4 00000000 
GPR24: 00000001 00000000 025fddb0 02607990 00000270 02607990 a7b5fff4 a6d14010 
NIP [a7a0bd7c] 0xa7a0bd7c
LR [a7a02ee4] 0xa7a02ee4
--- interrupt: 300
[...]

Full kernel dmesg and .config attached.

Regards,
Erhard

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