There was actually more this time, after 27s: [ 35.310528] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper:0] [ 35.310528] Modules linked in: [ 35.310528] CPU: 0 PID: 0 Comm: swapper Not tainted 4.19.0-06942-g6471f52af786 #114 [ 35.310528] pc = [<fffffc000085ee10>] ra = [<fffffc000085eda4>] ps = 0000 Not tainted [ 35.310528] pc is at _etext+0xb0/0x360 [ 35.310528] ra is at _etext+0x44/0x360 [ 35.310528] v0 = 0000000000000007 t0 = fffffc0000a776c8 t1 = fffffc0000aa5448 [ 35.310528] t2 = 000000000000000a t3 = 0000000000200102 t4 = fffffc0000a75270 [ 35.310528] t5 = 00000000fffb721e t6 = 0000000000003503 t7 = fffffc0000a48000 [ 35.310528] a0 = 0000000000000000 a1 = 0000000000000001 a2 = 0000000000000000 [ 35.310528] a3 = fffffc0000a590b8 a4 = 0000000000000000 a5 = fffffc00005bd6e0 [ 35.310528] t8 = 0000000000000000 t9 = 00006dc5acff0000 t10= 00000000d40d303b [ 35.310528] t11= 0003ba1a0002641d pv = fffffc000036e070 at = 0000000000000000 [ 35.310528] gp = fffffc0000a976c8 sp = 00000000af7577de [ 62.227507] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper:0] [ 62.227507] Modules linked in: [ 62.227507] CPU: 0 PID: 0 Comm: swapper Tainted: G L 4.19.0-06942-g6471f52af786 #114 [ 62.227507] pc = [<fffffc000085ee10>] ra = [<fffffc000085eda4>] ps = 0000 Tainted: G L [ 62.227507] pc is at _etext+0xb0/0x360 [ 62.227507] ra is at _etext+0x44/0x360 [ 62.227507] v0 = 0000000000000007 t0 = fffffc0000a776c8 t1 = fffffc0000aa5448 [ 62.227507] t2 = 000000000000000a t3 = 0000000000200102 t4 = fffffc0000a75270 [ 62.227507] t5 = 00000000fffb721e t6 = 0000000000003503 t7 = fffffc0000a48000 [ 62.227507] a0 = 0000000000000000 a1 = 0000000000000001 a2 = 0000000000000000 [ 62.227507] a3 = fffffc0000a590b8 a4 = 0000000000000000 a5 = fffffc00005bd6e0 [ 62.227507] t8 = 0000000000000000 t9 = 00006dc5acff0000 t10= 00000000d40d303b [ 62.227507] t11= 0003ba1a0002641d pv = fffffc000036e070 at = 0000000000000000 [ 62.227507] gp = fffffc0000a976c8 sp = 00000000af7577de [ 89.111282] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper:0] [ 89.111282] Modules linked in: [ 89.111282] CPU: 0 PID: 0 Comm: swapper Tainted: G L 4.19.0-06942-g6471f52af786 #114 [ 89.111282] pc = [<fffffc000085ee10>] ra = [<fffffc000085eda4>] ps = 0000 Tainted: G L [ 89.111282] pc is at _etext+0xb0/0x360 [ 89.111282] ra is at _etext+0x44/0x360 [ 89.111282] v0 = 0000000000000007 t0 = fffffc0000a776c8 t1 = fffffc0000aa5448 [ 89.111282] t2 = 000000000000000a t3 = 0000000000200102 t4 = fffffc0000a75270 [ 89.111282] t5 = 00000000fffb721e t6 = 0000000000003503 t7 = fffffc0000a48000 [ 89.111282] a0 = 0000000000000000 a1 = 0000000000000001 a2 = 0000000000000000 [ 89.111282] a3 = fffffc0000a590b8 a4 = 0000000000000000 a5 = fffffc00005bd6e0 [ 89.111282] t8 = 0000000000000000 t9 = 00006dc5acff0000 t10= 00000000d40d303b [ 89.111282] t11= 0003ba1a0002641d pv = fffffc000036e070 at = 0000000000000000 [ 89.111282] gp = fffffc0000a976c8 sp = 00000000af7577de and so on, repeating itself. -- Meelis Roos <mroos@xxxxxxxx>